Cas9 proteins and guiding features for DNA targeting and genome editing
The present invention is directed to methods and compositions comprising novel CRISPR polypeptides and polynucleotides for site-specific cleavage and nicking of nucleic acids, transcriptional control and genome editing.
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This application is a 35 U.S.C. § 371 national phase application of International Application Serial No. PCT/US2015/047136, filed Aug. 27, 2015, which claims the claims the benefit, under 35 U.S.C. § 119(e), of U.S. Provisional Application No. 62/043,882 filed Aug. 29, 2014 and U.S. Provisional Application No. 62/043,204 filed Aug. 28, 2014, the entire contents of each of which is incorporated by reference herein.
STATEMENT REGARDING ELECTRONIC FILING OF A SEQUENCE LISTINGA Sequence Listing in ASCII text format, submitted under 37 C.F.R. § 1.821, entitled 5051-869PR_ST25.txt, 1,678,777 bytes in size, generated on Aug. 8, 2018 and filed via EFS-Web, is provided in lieu of a paper copy. This Sequence Listing is hereby incorporated herein by reference into the specification for its disclosures.
FIELD OF THE INVENTIONThe invention relates to synthetic CRISPR-cas systems and methods of use thereof for site-specific cleavage and nicking, transcriptional control and genome editing.
BACKGROUND OF THE INVENTIONClustered Regularly interspaced Short Palindromic Repeats (CRISPR), in combination with associated sequences (cas) constitute the CRISPR-Cas system, which confers adaptive immunity in many bacteria. CRISPR-mediated immunization occurs through the uptake of DNA from invasive genetic elements such as plasmids and phages, as novel “spacers.”
CRISPR-Cas systems consist of arrays of short DNA repeats interspaced by hypervariable sequences, flanked by cas genes, that provide adaptive immunity against invasive genetic elements such as phage and plasmids, through sequence-specific targeting and interference (Barrangou et al. 2007. Science. 315:1709-1712; Brouns et al. 2008. Science 321:960-4; Horvath and Barrangou. 2010. Science. 327:167-70; Marraffini and Sontheimer. 2008. Science. 322:1843-1845; Bhaya et al. 2011. Anna. Rev. Genet. 45:273-297; Terns and Terns. 2011. Curr. Opin. Microbiol. 14:321-327; Westra et al. 2012. Anna. Rev. Genet. 46:311-339; Barrangou R. 2013. RNA. 4:267-278). Typically, invasive DNA sequences are acquired as novel “spacers” (Barrangou et al. 2007. Science. 315:1709-1712), each paired with a CRISPR repeat and inserted as a novel repeat-spacer unit in the CRISPR locus. Subsequently, the repeat-spacer array is transcribed as a long pre-CRISPR RNA (pre-crRNA) (Brouns et al. 2008. Science 321:960-4), which is processed into small interfering CRISPR RNAs (crRNAs) that drive sequence-specific recognition. Specifically, crRNAs guide nucleases towards complementary targets for sequence-specific nucleic acid cleavage mediated by Cas endonucleases (Garneau et al. 2010. Nature. 468:67-71; Haurwitz et al. 2010. Science. 329:1355-1358; Sapranauskas et al. 2011. Nucleic Acid Res. 39:9275-9282; Jinek et al. 2012. Science. 337:816-821; Gasiunas et al. 2012. Proc. Natl. Acad. Sci. 109:E2579-E2586; Magadan et al. 2012. PLoS One. 7:e40913; Karvelis et al. 2013. RNA Biol. 10:841-851). These widespread systems occur in nearly half of bacteria (˜46%) and the large majority of archaea (˜90%). They are classified into three main CRISPR-Cas systems types (Makarova et al. 2011. Nature Rev. Microbiol. 9:467-477; Makarova et al. 2013. Nucleic Acid Res. 41:4360-4377) based on the cas gene content, organization and variation in the biochemical processes that drive crRNA biogenesis, and Cas protein complexes that mediate target recognition and cleavage. In types I and III, the specialized Cas endonucleases process the pre-crRNAs, which then assemble into a large multi-Cas protein complex capable of recognizing and cleaving nucleic acids complementary to the crRNA. A different process is involved in Type II CRISPR-Cas systems. Here, the pre-CRNAs are processed by a mechanism in which a trans-activating crRNA (tracrRNA) hybridizes to repeat regions of the crRNA. The hybridized crRNA-tracrRNA are cleaved by RNase III and following a second event that removes the 5′ end of each spacer, mature crRNAs are produced that remain associated with the both the tracrRNA and Cas9. The mature complex then locates a target dsDNA sequence (‘protospacer’ sequence) that is complementary to the spacer sequence in the complex and cuts both strands. Target recognition and cleavage by the complex in the type II system not only requires a sequence that is complementary between the spacer sequence on the crRNA-tracrRNA complex and the target ‘protospacer’ sequence but also requires a protospacer adjacent motif (PAM) sequence located at the 3′ end of the protospacer sequence. The exact PAM sequence that is required can vary between different type II systems.
The present disclosure provides methods and compositions for increasing the efficiency and specificity of synthetic type II CRISPR-Cas systems in such uses as, for example, site-specific cleavage, site-specific nicking, transcriptional control and genome editing.
SUMMARY OF THE INVENTIONIn some embodiments of the invention a protein-RNA complex is provide, the complex comprising the following components: (a) a Cas9 polypeptide comprising the amino acid sequence having at least about 80% identity to a polypeptide comprising an amino acid sequence of any of SEQ ID NOs:194-293, or a functional fragment thereof; (b) a crRNA comprising a 3′ region and a 5′ region, wherein the 3′ region comprises at least about 10 consecutive nucleotides of a Clustered Regularly Interspaced Short Palindromic Repeat (CRISPR) repeat comprising a nucleotide sequence of any one of the nucleotide sequences of SEQ NOs:1-98, or a functional fragment thereof, and the 5′ region comprises at least about 10 consecutive nucleotides of a spacer sequence located upstream of the repeat; and (c) a tracrRNA comprising a 5′ and 3′ region wherein at least a portion of the 5′ region of the tracrRNA is complementary to the 3′ region (CRISPR repeat) of the crRNA.
In other embodiments, the invention provides a chimeric RNA construct comprising: (a) a crRNA comprising a 3′ region and a 5′ region, wherein the 3′ region comprises at least about 10 consecutive nucleotides of a CRISPR repeat comprising a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:1-98, or a functional fragment thereof, and the 5′ region comprises at least about 10 consecutive nucleotides of a spacer sequence located immediately upstream of the repeat, and (b) a tracrRNA comprising a 5′ and 3′ region, wherein at least a portion of the 5′ region of the tracrRNA is complementary to the 3′ region (CRISPR repeat) of the crRNA and the 3′ region of said tracrRNA forms secondary structures
In further embodiments, a method for site specific cleavage of a target DNA is provided, the method comprising: contacting a complex of the invention with the target DNA, thereby producing a site specific cleavage of the target DNA in a region defined by complementary binding of the spacer sequence of the crRNA to the target nucleic acid
In still further embodiments, a method for site specific cleavage of a target DNA is provided, the method comprising: contacting a chimeric RNA of the invention with the target DNA in the presence of a Cas9 polypeptide, thereby producing a site specific cleavage of the target nucleic acid in a region defined by complementary binding of the spacer sequence of the crRNA to the target DNA.
In some embodiments, the invention provides a method of transcriptional control of a target DNA, comprising: contacting a complex of the invention with the target DNA, wherein the complex binds to the target DNA and the Cas9 polypeptide of the complex is deactivated, thereby controlling the transcription of the target DNA. In some embodiments, the invention provides a method of transcriptional control of a target DNA, comprising: contacting a chimeric RNA of the invention with the target DNA in the presence of an deactivated Cas9 polypeptide, wherein the chimeric RNA binds to the target DNA, thereby controlling the transcription of the target DNA. In some embodiments, the deactivated Cas9 polypeptide is fused with a transcriptional activator, thereby activating transcription of the target DNA.
In other embodiments, a method of DNA editing is provided, the method comprising: contacting a complex of the present invention with the target DNA, wherein the complex binds to the target DNA, thereby editing the target DNA.
In still other embodiments, a method of DNA editing is provided, the method comprising: contacting a chimeric RNA of the invention with the target DNA in the presence of a Cas9 polypeptide, wherein the chimeric RNA binds to the target DNA, thereby editing the target DNA.
In additional embodiments, a method for cleaving a double stranded polynucleotide is provided, comprising contacting a complex of the invention with said polynucleotide, wherein the polynucleotide comprises: (a) a protospacer sequence comprising a sequence that is least 80% complementary to the spacer sequence in the crRNA in said complex, and (b) a protospacer adjacent motif (PAM) comprising a nucleotide sequence of any one of the nucleotide sequences of 5′-NGG-3′, 5′-NGAAA-3′, 5′-NNG-3′, 5′-NGA-3′, 5′-NTAA-3′, 5′-NTG-3′, 5′-NNC-3′, 5′-NNAAC-3′, 5′-AGA-3′, 5′-NNNANNA-3′, 5′-NNANAA-3′, 5′-NNAAAA-3′, and/or 5′-AAAA-3′ downstream from the protospacer sequence.
In some embodiments, a method for site specific cleavage of a target DNA is provided, comprising: contacting a CRISPR RNA (crRNA) and a trans-encoded CRISPR RNA (tracrRNA) with the target DNA in the presence of a Cas9 polypeptide, wherein (a) the crRNA comprises at its 3′ region a repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., and at its 5′ region a spacer sequence from the target DNA, (b) the tracrRNA comprises a sequence at its 5′ region that is complementary to the repeat of the crRNA, and (c) the spacer sequence hybridizes with a portion of the target DNA that is complementary to the spacer sequence and adjacent to a protospacer adjacent motif (PAM) comprising the nucleotide sequence of any one of the nucleotide sequences of 5′-NGG-3′, 5′-NGAAA-3′, 5′-NNG-3′, 5′-NGA-3′, 5′-NTAA-3′, 5′-NTG-3′, 5′-NNC-3′, 5′-NNAAC-3′, 5′-AGA-3′, 5′-NNNANNA-3′, 5′-NNANAA-3′, 5′-NNAAAA-3′, and/or 5′-AAAA-3′, thereby resulting in a site specific cleavage of the target DNA in the region defined by the complementary binding of the spacer sequence of the crRNA to the target DNA. In some embodiments, the crRNA comprises a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:1-98, or a functional fragment thereof, the tracrRNA comprises a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:99-193, or a functional fragment thereof, and the Cas9 polypeptide is from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. In some embodiments, the Cas9 polypeptide comprises an amino acid sequence having at least about 80% identity to a polypeptide comprising the amino acid sequence of any one of SEQ ID NOs:194-293, or a functional fragment thereof.
In further embodiments, a method for site-specific nicking of a (+) strand of a double stranded target DNA is provided, the method comprising contacting a protein-RNA complex with a double stranded target DNA, wherein the complex comprises (a) a crRNA comprising a 3′ region and a 5′ region, wherein the 3′ region comprises at least about 10 consecutive nucleotides of a CRISPR repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., and the 5′ region comprises at least about 10 consecutive nucleotides of a spacer sequence located upstream of the repeat, (b) a tracrRNA comprising a 5′ and 3′ region wherein at least a portion of the 5′ region of the tracrRNA is complementary to the 3′ region (repeat) of the crRNA, and (c) a polypeptide comprising the amino acid sequence of any one of SEQ ID NOs:194-293, or a functional fragment thereof, and comprising a point mutation in a RuvC active site motif; and the target DNA comprises a protospacer sequence that is at least about 80% complementary to the spacer sequence in the crRNA and a protospacer adjacent motif (PAM) sequence of any one of the nucleotide sequences of 5′-NGG-3′, 5′-NGAAA-3′, 5′-NNG-3′, 5′-NGA-3′, 5′-NTAA-3′, 5′-NTG-3′, 5′-NNC-3′, 5′-NNAAC-'′, 5′-AGA-3′, 5′-NNNANNA-3′, 5′-NNANAA-3′, 5′-NNAAAA-3′, and/or 5′-AAAA-3′, downstream from the proto-spacer sequence, wherein the polypeptide cleaves the (+) strand of the double stranded DNA at a cleavage site located 5 nucleotides upstream of the PAM sequence, thereby producing a site-specific nick in said double stranded target DNA.
In additional embodiments, the invention provides a method for site-specific nicking of the (−) strand of a double stranded target DNA, comprising contacting a protein-RNA complex with a double stranded target DNA, wherein the complex comprises: (a) a crRNA comprising a 3′ region and a 5′ region, wherein the 3′ region comprises at least about 10 consecutive nucleotides of a CRISPR repeat from a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., and the 5′ region comprises at least about 10 consecutive nucleotides of a spacer sequence located upstream of the repeat, (b) a tracrRNA comprising a 5′ and 3′ region wherein at least a portion of the 5′ region of the tracrRNA is complementary to the 3′ region (repeat) of the crRNA, and (c) a polypeptide comprising the amino acid sequence of any one of SEQ ID NOs:194-293, or a functional fragment thereof, and comprising a point mutation in an HNH active site motif; and the target DNA comprises a protospacer sequence that is at least about 80% complementary to the spacer sequence in the crRNA and a protospacer adjacent motif (PAM) sequence comprising a nucleotide sequence of any one of the nucleotide sequences of 5′-NGG-3′, 5′-NGAAA-3′, 5′-NNG-3′, 5′-NGA-3′, 5′-NTAA-3′, 5′-NTG-3′, 5′-NNC-3′, 5′-NNAAC-3′, 5′-AGA-3′, 5′-NNNANNA-3′, 5′-NNANAA-3′, 5′-NNAAAA-3′, and/or 5′-AAAA-3′ downstream from the proto-spacer sequence, wherein the polypeptide cleaves the (−) strand of the double stranded DNA at a cleavage site located 5 nucleotides upstream of the PAM sequence resulting in site-specific nicking of the target DNA. In some embodiments, the CRISPR repeat comprises a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:1-98, or a functional fragment thereof, and/or the tracrRNA comprises a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:99-193, or a functional fragment thereof.
In further embodiments, a method for site-specific cleavage of a target DNA in an organism is provided, the method comprising: introducing a protein-RNA complex into said organism or at least one cell of said organism, wherein the protein-RNA complex comprises a crRNA comprising in its 3′ region a repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., and in its 5′ region a spacer sequence having complementarity to a site in the target DNA in which a modification is desired; a polypeptide having at least about 80% identity with a Cas9 polypeptide of Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., or Olsenella spp., and a tracrRNA comprising a sequence at its 5′ region that is complementary sequence to the repeat of the crRNA, thereby producing a site-specific cleavage of the target DNA molecule in a region that is determined by the complementary spacer sequence of the crRNA to the target DNA molecule. In some embodiments, the polypeptide having at least about 80% identity with a Cas9 polypeptide comprises a polypeptide comprising the amino acid sequences of any of SEQ ID NOs:194-293, or a functional fragment thereof, the crRNA comprises a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:1-98, or a functional fragment thereof, and/or the tracrRNA comprises a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:99-193, or a functional fragment thereof.
In additional embodiments, a method of typing a bacterial strain in a sample is provided, the method comprising amplifying a region of DNA comprising repetitive sequences that are at least about 80% identical to a repetitive sequence encoded by a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:1-98, or a functional fragment thereof, in said sample to produce amplified DNA; and typing the bacterial strain based on the amplified DNA.
In additional embodiments, the invention provides a method of detecting the presence of a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., in a sample, comprising: amplifying in said sample a region of DNA comprising repetitive sequences that are at least about 80% identical to the repetitive sequence encoded by a nucleotide sequence of any of the nucleotide sequences of SEQ ID NOs:1-98, or a functional fragment thereof, to produce amplified DNA, and detecting the amplified DNA.
In a further embodiment, the invention provides a method of identifying a strain of Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., having resistance to an invasive foreign DNA, comprising: detecting a CRISPR spacer in said strain of Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., wherein said CRISPR spacer is correlated with resistance to said invasive foreign DNA (e.g., phage DNA, plasmid DNA, chromosomal DNA, transposon) in Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., thereby identifying said strain as comprising said CRISPR spacer and having resistance to said invasive foreign DNA. In some embodiments, the method comprises correlating the presence of a CRISPR spacer with resistance to said invasive foreign DNA (e.g., phage DNA, plasmid DNA, chromosomal DNA, transposon) in Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. having a CRISPR system. In some embodiments, the method further comprises amplifying the DNA of said strain of Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. using amplification primers for amplifying the CRISPR spacer correlated with resistance, thereby producing a CRISPR spacer amplicon when said CRISPR spacer is present, thereby detecting the presence or absence of said CRISPR spacer amplicon.
In still further embodiments, the invention provides a method for modifying (conferring or increasing) resistance of a bacterium or an archaeon to an invasive foreign DNA, comprising: introducing into said bacterium or archaeon a heterologous nucleic acid molecule comprising a first and a second CRISPR repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. and a CRISPR spacer, wherein the spacer is homologous to at least a portion of the invasive foreign DNA and is located 3′ of the first CRISPR repeat and 5′ of the second CRISPR repeat to produce transformed bacterial or archaeon cells, and selecting transformed bacteria or archeaon cells having modified resistance to said invasive foreign DNA.
The invention further provides expression cassettes, vectors and cells comprising the nucleotide sequences of this invention.
These and other aspects of the invention are set forth in more detail in the description of the invention below.
The present invention now will be described hereinafter with reference to the accompanying drawings and examples, in which embodiments of the invention are shown. This description is not intended to be a detailed catalog of all the different ways in which the invention may be implemented, or all the features that may be added to the instant invention. For example, features illustrated with respect to one embodiment may be incorporated into other embodiments, and features illustrated with respect to a particular embodiment may be deleted from that embodiment. Thus, the invention contemplates that in some embodiments of the invention, any feature or combination of features set forth herein can be excluded or omitted. In addition, numerous variations and additions to the various embodiments suggested herein will be apparent to those skilled in the art in light of the instant disclosure, which do not depart from the instant invention. Hence, the following descriptions are intended to illustrate some particular embodiments of the invention, and not to exhaustively specify all permutations, combinations and variations thereof.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
All publications, patent applications, patents and other references cited herein are incorporated by reference in their entireties for the teachings relevant to the sentence and/or paragraph in which the reference is presented.
Unless the context indicates otherwise, it is specifically intended that the various features and embodiments of the invention described herein can be used in any combination. Moreover, the present invention also contemplates that in some embodiments of the invention, any feature or combination of features set forth herein can be excluded or omitted. To illustrate, if the specification states that a composition comprises components A, B and C, it is specifically intended that any of A, B or C, or a combination thereof, can be omitted and disclaimed singularly or in any combination.
As used in the description of the invention and the appended claims, the singular forms “a,” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Also as used herein, “and/or” refers to and encompasses any and all possible combinations of one or more of the associated listed items, as well as the lack of combinations when interpreted in the alternative (“or”).
The term “about,” as used herein when referring to a measurable value such as a dosage or time period and the like, is meant to encompass variations of ±20%, ±10%, ±5%, ±1%, ±0.5%, or even ±0.1% of the specified amount.
As used herein, phrases such as “between X and Y” and “between about X and Y” should be interpreted to include X and Y. As used herein, phrases such as “between about X and Y” mean “between about X and about Y” and phrases such as “from about X to Y” mean “from about X to about Y.”
The term “comprise,” “comprises” and “comprising” as used herein, specify the presence of the stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
As used herein, the transitional phrase “consisting essentially of” means that the scope of a claim is to be interpreted to encompass the specified materials or steps recited in the claim and those that do not materially affect the basic and novel characteristic(s) of the claimed invention. Thus, the term “consisting essentially of” when used in a claim of this invention is not intended to be interpreted to be equivalent to “comprising.”
As used herein, the terms “increase,” “increasing,” “increased,” “enhance,” “enhanced,” “enhancing,” and “enhancement” (and grammatical variations thereof) describe an elevation of at least about 25%, 50%, 75%, 100%, 150%, 200%, 300%, 400%, 500% or more as compared to a control.
As used herein, the terms “reduce,” “reduced,” “reducing,” “reduction,” “diminish,” “suppress,” and “decrease” (and grammatical variations thereof), describe, for example, a decrease of at least about 5%, 10%, 15%, 20%, 25%, 35%, 50%, 75%, 80%, 85%, 90%, 95%, 97% or more, as compared to a control. In particular embodiments, the reduction results in no or essentially no (i.e., an insignificant amount, e.g., less than about 10% or even 5%) detectable activity or amount.
A “heterologous” or a “recombinant” nucleotide sequence is a nucleotide sequence not naturally associated with a host cell into which it is introduced, including non-naturally occurring multiple copies of a naturally occurring nucleotide sequence.
A “native” or “wild type” nucleic acid, nucleotide sequence, polypeptide or amino acid sequence refers to a naturally occurring or endogenous nucleic acid, nucleotide sequence, polypeptide or amino acid sequence. Thus, for example, a “wild type mRNA” is an mRNA that is naturally occurring in or endogenous to the organism. A “homologous” nucleic acid sequence is a nucleotide sequence naturally associated with a host cell into which it is introduced.
Also as used herein, the terms “nucleic acid,” “nucleic acid molecule,” “nucleotide sequence” and “polynucleotide” refer to RNA or DNA that is linear or branched, single or double stranded, or a hybrid thereof. The term also encompasses RNA/DNA hybrids. When dsRNA is produced synthetically, less common bases, such as inosine, 5-methylcytosine, 6-methyladenine, hypoxanthine and others can also be used for antisense, dsRNA, and ribozyme pairing. For example, polynucleotides that contain C-5 propyne analogues of uridine and cytidine have been shown to bind RNA with high affinity and to be potent antisense inhibitors of gene expression. Other modifications, such as modification to the phosphodiester backbone, or the 2′-hydroxy in the ribose sugar group of the RNA can also be made.
As used herein, the term “nucleotide sequence” refers to a heteropolymer of nucleotides or the sequence of these nucleotides from the 5′ to 3′ end of a nucleic acid molecule and includes DNA or RNA molecules, including cDNA, a DNA fragment or portion, genomic DNA, synthetic (e.g., chemically synthesized) DNA, plasmid DNA, mRNA, and anti-sense RNA, any of which can be single stranded or double stranded. The terms “nucleotide sequence” “nucleic acid,” “nucleic acid molecule,” “oligonucleotide” and “polynucleotide” are also used interchangeably herein to refer to a heteropolymer of nucleotides. Nucleic acid molecules and/or nucleotide sequences provided herein are presented herein in the 5′ to 3′ direction, from left to right and are represented using the standard code for representing the nucleotide characters as set forth in the U.S. sequence rules, 37 CFR §§ 1.821-1.825 and the World Intellectual Property Organization (WIPO) Standard ST.25. A “5′ region” as used herein can mean the region of a polynucleotide that is nearest the 5′ end. Thus, for example, an element in the 5′ region of a polynucleotide can be located anywhere from the first nucleotide located at the 5′ end of the polynucleotide to the nucleotide located halfway through the polynucleotide. A “3′ region” as used herein can mean the region of a polynucleotide that is nearest the 3′ end. Thus, for example, an element in the 3′ region of a polynucleotide can be located anywhere from the first nucleotide located at the 3′ end of the polynucleotide to the nucleotide located halfway through the polynucleotide.
As used herein, the term “gene” refers to a nucleic acid molecule capable of being used to produce mRNA, antisense RNA, miRNA, anti-microRNA antisense oligodeoxyribonucleotide (AMO) and the like. Genes may or may not be capable of being used to produce a functional protein or gene product. Genes can include both coding and non-coding regions (e.g., introns, regulatory elements, promoters, enhancers, termination sequences and/or 5′ and 3′ untranslated regions). A gene may be “isolated” by which is meant a nucleic acid that is substantially or essentially free from components normally found in association with the nucleic acid in its natural state. Such components include other cellular material, culture medium from recombinant production, and/or various chemicals used in chemically synthesizing the nucleic acid.
The terms, “invasive foreign genetic element,” “invasive foreign nucleic acid” or “invasive foreign DNA” mean DNA that is foreign to the bacteria or archaea (e.g., genetic elements from, for example, pathogens including, but not limited to, viruses, bacteriophages, and/or plasmids).
The terms “complementary” or “complementarily,” as used herein, refer to the natural binding of polynucleotides under permissive salt and temperature conditions by base-pairing. For example, the sequence “A-G-T” binds to the complementary sequence “T-C-A.” Complementarity between two single-stranded molecules may be “partial,” in which only some of the nucleotides bind, or it may be complete when total complementarity exists between the single stranded molecules. The degree of complementarity between nucleic acid strands has significant effects on the efficiency and strength of hybridization between nucleic acid strands.
“Complement” as used herein can mean 100% complementarity or identity with the comparator nucleotide sequence or it can mean less than 100% complementarity (e.g., about 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and the like, complementarity).
A “portion” or “fragment” of a nucleotide sequence of the invention will be understood to mean a nucleotide sequence of reduced length relative (e.g., reduced by 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 or more nucleotides) to a reference nucleic acid or nucleotide sequence and comprising, consisting essentially of and/or consisting of a nucleotide sequence of contiguous nucleotides identical or almost identical (e.g., 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99% identical) to the reference nucleic acid or nucleotide sequence. Such a nucleic acid fragment or portion according to the invention may be, where appropriate, included in a larger polynucleotide of which it is a constituent.
Different nucleic acids or proteins having homology are referred to herein as “homologues.” The term homologue includes homologous sequences from the same and other species and orthologous sequences from the same and other species. “Homology” refers to the level of similarity between two or more nucleic acid and/or amino acid sequences in terms of percent of positional identity (i.e., sequence similarity or identity). Homology also refers to the concept of similar functional properties among different nucleic acids or proteins. Thus, the compositions and methods of the invention further comprise homologues to the nucleotide sequences and polypeptide sequences of this invention. “Orthologous,” as used herein, refers to homologous nucleotide sequences and/or amino acid sequences in different species that arose from a common ancestral gene during speciation. A homologue of a nucleotide sequence of this invention has a substantial sequence identity (e.g., at least about 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and/or 100%) to said nucleotide sequence of the invention.
As used herein “sequence identity” refers to the extent to which two optimally aligned polynucleotide or peptide sequences are invariant throughout a window of alignment of components, e.g., nucleotides or amino acids. “Identity” can be readily calculated by known methods including, but not limited to, those described in: Computational Molecular Biology (Lesk, A. M., ed.) Oxford University Press, New York (1988); Biocomputing: Informatics and Genome Projects (Smith, D. W., ed.) Academic Press, New York (1993); Computer Analysis of Sequence Data, Part I (Griffin, A. M., and Griffin, H. G., eds.) Humana Press, New Jersey (1994); Sequence Analysis in Molecular Biology (von Heinje, G., ed.) Academic Press (1987); and Sequence Analysis Primer (Gribskov, M. and Devereux, J., eds.) Stockton Press, New York (1991).
As used herein, the term “percent sequence identity” or “percent identity” refers to the percentage of identical nucleotides in a linear polynucleotide sequence of a reference (“query”) polynucleotide molecule (or its complementary strand) as compared to a test (“subject”) polynucleotide molecule (or its complementary strand) when the two sequences are optimally aligned. In some embodiments, “percent identity” can refer to the percentage of identical amino acids in an amino acid sequence.
As used herein, the phrase “substantially identical,” or “substantial identity” in the context of two nucleic acid molecules, nucleotide sequences or protein sequences, refers to two or more sequences or subsequences that have at least about 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and/or 100% nucleotide or amino acid residue identity, when compared and aligned for maximum correspondence, as measured using one of the following sequence comparison algorithms or by visual inspection. In some embodiments of the invention, the substantial identity exists over a region of consecutive residues of an amino sequence of the invention that is at least about 50 residues to about 1400 residues in length, about 100 residues to about 1300 residues, about 150 residues to about 1250 residues, about 200 residues to about 1200 residues, about 250 residues to about 1150 residues, about 300 residues to about 1100 residues, about 350 residues to about 1050 residues, about 400 residues to about 1000 residues, about 450 residues to about 950 residues, about 500 residues to about 900 residues, about 550 residues to about 850 residues, about 50 residues to about 100 residues in length, about 100 residues to about 200 residues, about 200 residues to about 400 residues, about 300 residues to about 500 residues, about 400 residues to about 600 residues, and the like, and any value or range therein, up to the full length of the sequence. In some embodiments of the invention, the substantial identity exists over a region of consecutive nucleotides of a nucleotide sequence of the invention that is about 16 nucleotides to about 30 nucleotides, about 18 nucleotides to about 25 nucleotides, about 30 nucleotides to about 40 nucleotides, about 50 nucleotides to about 60 nucleotides, about 70 nucleotides to about 80 nucleotides, about 90 nucleotides to about 100 nucleotides, about 150 nucleotides to about 200 nucleotides, to about 250 nucleotide to about 400 nucleotides, about 500 nucleotides to about 750 nucleotides, about 700 nucleotides to about 1000 nucleotides, about 1250 nucleotides to about 2500 nucleotides, about 2000 nucleotides to about 4000 nucleotides, or more nucleotides in length, and any range therein, up to the full length of the sequence. In representative embodiments, the nucleotide sequences can be substantially identical over at least about 22 nucleotides. In some particular embodiments, the amino acid sequences are substantially identical over at least about 150 residues. In some embodiments, nucleotide sequences of the invention can be about 70% to about 100% identical over at least about 16 nucleotides to about 25 nucleotides. In some embodiments, nucleotide sequences of the invention can be about 75% to about 100% identical over at least about 16 nucleotides to about 25 nucleotides. In further embodiments, nucleotide sequences of the invention can be about 80% to about 100% identical over at least about 16 nucleotides to about 25 nucleotides. In some embodiments, sequences of the invention can be about 70% identical over at least about 18 nucleotides. In other embodiments, the sequences can be about 85% identical over about 22 nucleotides. In still other embodiments, the sequences can be 100% homologous over about 16 nucleotides. In a further embodiment, the sequences are substantially identical over the entire length of the coding regions. Furthermore, in representative embodiments, substantially identical nucleotide or protein sequences perform substantially the same function (e.g., repeats, Cas9 nuclease activity).
For sequence comparison, typically one sequence acts as a reference sequence to which test sequences are compared. When using a sequence comparison algorithm, test and reference sequences are entered into a computer, subsequence coordinates are designated if necessary, and sequence algorithm program parameters are designated. The sequence comparison algorithm then calculates the percent sequence identity for the test sequence(s) relative to the reference sequence, based on the designated program parameters.
Optimal alignment of sequences for aligning a comparison window are well known to those skilled in the art and may be conducted by tools such as the local homology algorithm of Smith and Waterman, the homology alignment algorithm of Needleman and Wunsch, the search for similarity method of Pearson and Lipman, and optionally by computerized implementations of these algorithms such as GAP, BESTFIT, FASTA, and TFASTA available as part of the GCG® Wisconsin Package® (Accelrys Inc., San Diego, Calif.). An “identity fraction” for aligned segments of a test sequence and a reference sequence is the number of identical components which are shared by the two aligned sequences divided by the total number of components in the reference sequence segment, i.e., the entire reference sequence or a smaller defined part of the reference sequence. Percent sequence identity is represented as the identity fraction multiplied by 100. The comparison of one or more polynucleotide sequences may be to a full-length polynucleotide sequence or a portion thereof, or to a longer polynucleotide sequence. For purposes of this invention “percent identity” may also be determined using BLASTX version 2.0 for translated nucleotide sequences and BLASTN version 2.0 for polynucleotide sequences.
Software for performing BLAST analyses is publicly available through the National Center for Biotechnology Information. This algorithm involves first identifying high scoring sequence pairs (HSPs) by identifying short words of length W in the query sequence, which either match or satisfy some positive-valued threshold score T when aligned with a word of the same length in a database sequence. T is referred to as the neighborhood word score threshold (Altschul et al., 1990). These initial neighborhood word hits act as seeds for initiating searches to find longer HSPs containing them. The word hits are then extended in both directions along each sequence for as far as the cumulative alignment score can be increased. Cumulative scores are calculated using, for nucleotide sequences, the parameters M (reward score for a pair of matching residues; always >0) and N (penalty score for mismatching residues; always <0). For amino acid sequences, a scoring matrix is used to calculate the cumulative score. Extension of the word hits in each direction are halted when the cumulative alignment score falls off by the quantity X from its maximum achieved value, the cumulative score goes to zero or below due to the accumulation of one or more negative-scoring residue alignments, or the end of either sequence is reached. The BLAST algorithm parameters W, T, and X determine the sensitivity and speed of the alignment. The BLASTN program (for nucleotide sequences) uses as defaults a wordlength (W) of 11, an expectation (E) of 10, a cutoff of 100, M=5, N=−4, and a comparison of both strands. For amino acid sequences, the BLASTP program uses as defaults a wordlength (W) of 3, an expectation (E) of 10, and the BLOSUM62 scoring matrix (see Henikoff & Henikoff, Proc. Natl. Acad. Sci. USA 89: 10915 (1989)).
In addition to calculating percent sequence identity, the BLAST algorithm also performs a statistical analysis of the similarity between two sequences (see, e.g., Karlin & Altschul, Proc. Nat'l. Acad. Sci. USA 90: 5873-5787 (1993)). One measure of similarity provided by the BLAST algorithm is the smallest sum probability (P(N)), which provides an indication of the probability by which a match between two nucleotide or amino acid sequences would occur by chance. For example, a test nucleic acid sequence is considered similar to a reference sequence if the smallest sum probability in a comparison of the test nucleotide sequence to the reference nucleotide sequence is less than about 0.1 to less than about 0.001. Thus, in some embodiments of the invention, the smallest sum probability in a comparison of the test nucleotide sequence to the reference nucleotide sequence is less than about 0.001.
Two nucleotide sequences can also be considered to be substantially complementary when the two sequences hybridize to each other under stringent conditions. In some representative embodiments, two nucleotide sequences considered to be substantially complementary hybridize to each other under highly stringent conditions.
“Stringent hybridization conditions” and “stringent hybridization wash conditions” in the context of nucleic acid hybridization experiments such as Southern and Northern hybridizations are sequence dependent, and are different under different environmental parameters. An extensive guide to the hybridization of nucleic acids is found in Tijssen Laboratory Techniques in Biochemistry and Molecular Biology—Hybridization with Nucleic Acid Probes part I chapter 2 “Overview of principles of hybridization and the strategy of nucleic acid probe assays” Elsevier, New York (1993). Generally, highly stringent hybridization and wash conditions are selected to be about 5° C. lower than the thermal melting point (Tm) for the specific sequence at a defined ionic strength and pH.
The Tm is the temperature (under defined ionic strength and pH) at which 50% of the target sequence hybridizes to a perfectly matched probe. Very stringent conditions are selected to be equal to the Tm for a particular probe. An example of stringent hybridization conditions for hybridization of complementary nucleotide sequences which have more than 100 complementary residues on a filter in a Southern or northern blot is 50% formamide with 1 mg of heparin at 42° C., with the hybridization being carried out overnight. An example of highly stringent wash conditions is 0.1 5M NaCl at 72° C. for about 15 minutes. An example of stringent wash conditions is a 0.2× SSC wash at 65° C. for 15 minutes (see, Sambrook, infra, for a description of SSC buffer). Often, a high stringency wash is preceded by a low stringency wash to remove background probe signal. An example of a medium stringency wash for a duplex of, e.g., more than 100 nucleotides, is 1× SSC at 45° C. for 15 minutes. An example of a low stringency wash for a duplex of, e.g., more than 100 nucleotides, is 4-6× SSC at 40° C. for 15 minutes. For short probes (e.g., about 10 to 50 nucleotides), stringent conditions typically involve salt concentrations of less than about 1.0 M Na ion, typically about 0.01 to 1.0 M Na ion concentration (or other salts) at pH 7.0 to 8.3, and the temperature is typically at least about 30° C. Stringent conditions can also be achieved with the addition of destabilizing agents such as formamide. In general, a signal to noise ratio of 2× (or higher) than that observed for an unrelated probe in the particular hybridization assay indicates detection of a specific hybridization. Nucleotide sequences that do not hybridize to each other under stringent conditions are still substantially identical if the proteins that they encode are substantially identical. This can occur, for example, when a copy of a nucleotide sequence is created using the maximum codon degeneracy permitted by the genetic code.
The following are examples of sets of hybridization/wash conditions that may be used to clone homologous nucleotide sequences that are substantially identical to reference nucleotide sequences of the invention. In one embodiment, a reference nucleotide sequence hybridizes to the “test” nucleotide sequence in 7% sodium dodecyl sulfate (SDS), 0.5 M NaPO4, 1 mM EDTA at 50° C. with washing in 2× SSC, 0.1% SDS at 50° C. In another embodiment, the reference nucleotide sequence hybridizes to the “test” nucleotide sequence in 7% sodium dodecyl sulfate (SDS), 0.5 M NaPO4, 1 mM EDTA at 50° C. with washing in 1× SSC, 0.1% SDS at 50° C. or in 7% sodium dodecyl sulfate (SDS), 0.5 M NaPO4, 1 mM EDTA at 50° C. with washing in 0.5× SSC, 0.1% SDS at 50° C. In still further embodiments, the reference nucleotide sequence hybridizes to the “test” nucleotide sequence in 7% sodium dodecyl sulfate (SDS), 0.5 M NaPO4, 1 mM EDTA at 50° C. with washing in 0.1× SSC, 0.1% SDS at 50° C., or in 7% sodium dodecyl sulfate (SDS), 0.5 M NaPO4, 1 mM EDTA at 50° C. with washing in 0.1× SSC, 0.1% SDS at 65° C.
In particular embodiments, a further indication that two nucleotide sequences or two polypeptide sequences are substantially identical can be that the protein encoded by the first nucleic acid is immunologically cross reactive with the protein encoded by the second nucleic acid.
Any nucleotide sequence and/or recombinant nucleic acid molecule of this invention can be codon optimized for expression in any organism of interest. Codon optimization is well known in the art and involves modification of a nucleotide sequence for codon usage bias using species specific codon usage tables. The codon usage tables are generated based on a sequence analysis of the most highly expressed genes for the organism/species of interest. When the nucleotide sequences are to be expressed in the nucleus, the codon usage tables are generated based on a sequence analysis of highly expressed nuclear genes for the species of interest. The modifications of the nucleotide sequences are determined by comparing the species specific codon usage table with the codons present in the native polynucleotide sequences. As is understood in the art, codon optimization of a nucleotide sequence results in a nucleotide sequence having less than 100% identity (e.g., 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and the like) to the native nucleotide sequence but which still encodes a polypeptide having the same function as that encoded by the original, native nucleotide sequence. Thus, in representative embodiments of the invention, the nucleotide sequence and/or recombinant nucleic acid molecule of this invention can be codon optimized for expression in the particular plant species of interest. In some embodiments, the codon optimized nucleotide sequences of SEQ ID NOs:194-293, and/or a functional fragment thereof, have about 70% to about 99% identity to the nucleotide sequences of SEQ ID NO:194-293 and/or a functional fragment thereof.
In some embodiments, the recombinant nucleic acids molecules, nucleotide sequences and polypeptides of the invention are “isolated.” An “isolated” nucleic acid molecule, an “isolated” nucleotide sequence or an “isolated” polypeptide is a nucleic acid molecule, nucleotide sequence or polypeptide that, by the hand of man, exists apart from its native environment and is therefore not a product of nature. An isolated nucleic acid molecule, nucleotide sequence or polypeptide may exist in a purified form that is at least partially separated from at least some of the other components of the naturally occurring organism or virus, for example, the cell or viral structural components or other polypeptides or nucleic acids commonly found associated with the polynucleotide. In representative embodiments, the isolated nucleic acid molecule, the isolated nucleotide sequence and/or the isolated polypeptide is at least about 1%, 5%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, or more pure.
In other embodiments, an isolated nucleic acid molecule, nucleotide sequence or polypeptide may exist in a non-native environment such as, for example, a recombinant host cell. Thus, for example, with respect to nucleotide sequences, the term “isolated” means that it is separated from the chromosome and/or cell in which it naturally occurs. A polynucleotide is also isolated if it is separated from the chromosome and/or cell in which it naturally occurs in and is then inserted into a genetic context, a chromosome and/or a cell in which it does not naturally occur (e.g., a different host cell, different regulatory sequences, and/or different position in the genome than as found in nature). Accordingly, the recombinant nucleic acid molecules, nucleotide sequences and their encoded polypeptides are “isolated” in that, by the hand of man, they exist apart from their native environment and therefore are not products of nature, however, in some embodiments, they can be introduced into and exist in a recombinant host cell.
In any of the embodiments described herein, the nucleotide sequences and/or recombinant nucleic acid molecules of the invention can be operatively associated with a variety of promoters and other regulatory elements for expression in an organism of interest and/or a cell of an organism of interest. Thus, in representative embodiments, a recombinant nucleic acid of this invention can further comprise one or more promoters operably linked to one or more nucleotide sequences.
By “operably linked” or “operably associated” as used herein, it is meant that the indicated elements are functionally related to each other, and are also generally physically related. Thus, the term “operably linked” or “operably associated” as used herein, refers to nucleotide sequences on a single nucleic acid molecule that are functionally associated. Thus, a first nucleotide sequence that is operably linked to a second nucleotide sequence, means a situation when the first nucleotide sequence is placed in a functional relationship with the second nucleotide sequence. For instance, a promoter is operably associated with a nucleotide sequence if the promoter effects the transcription or expression of said nucleotide sequence. Those skilled in the art will appreciate that the control sequences (e.g., promoter) need not be contiguous with the nucleotide sequence to which it is operably associated, as long as the control sequences function to direct the expression thereof. Thus, for example, intervening untranslated, yet transcribed, sequences can be present between a promoter and a nucleotide sequence, and the promoter can still be considered “operably linked” to the nucleotide sequence.
A “promoter” is a nucleotide sequence that controls or regulates the transcription of a nucleotide sequence (i.e., a coding sequence) that is operably associated with the promoter. The coding sequence may encode a polypeptide and/or a functional RNA. Typically, a “promoter” refers to a nucleotide sequence that contains a binding site for RNA polymerase II and directs the initiation of transcription. In general, promoters are found 5′, or upstream, relative to the start of the coding region of the corresponding coding sequence. The promoter region may comprise other elements that act as regulators of gene expression. These include a TATA box consensus sequence, and often a CAAT box consensus sequence (Breathnach and Chambon, (1981) Annu. Rev. Biochem. 50:349). In plants, the CAAT box may be substituted by the AGGA box (Messing et al., (1983) in Genetic Engineering of Plants, T. Kosuge, C. Meredith and A. Hollaender (eds.), Plenum Press, pp. 211-227).
Promoters can include, for example, constitutive, inducible, temporally regulated, developmentally regulated, chemically regulated, tissue-preferred and/or tissue-specific promoters for use in the preparation of recombinant nucleic acid molecules, i.e., “chimeric genes” or “chimeric polynucleotides.” These various types of promoters are known in the art.
The choice of promoter will vary depending on the temporal and spatial requirements for expression, and also depending on the host cell to be transformed. Promoters for many different organisms are well known in the art. Based on the extensive knowledge present in the art, the appropriate promoter can be selected for the particular host organism of interest. Thus, for example, much is known about promoters upstream of highly constitutively expressed genes in model organisms and such knowledge can be readily accessed and implemented in other systems as appropriate.
In some embodiments, a recombinant nucleic acid molecule of the invention can be an “expression cassette” or can be comprised within an expression cassette. As used herein, “expression cassette” means a recombinant nucleic acid molecule comprising a nucleotide sequence of interest (e.g., the nucleotide sequences of the invention), wherein said nucleotide sequence is operably associated with at least a control sequence (e.g., a promoter). Thus, some embodiments of the invention provide expression cassettes designed to express the nucleotides sequences of the invention.
An expression cassette comprising a nucleotide sequence of interest may be chimeric, meaning that at least one of its components is heterologous with respect to at least one of its other components. An expression cassette may also be one that is naturally occurring but has been obtained in a recombinant form useful for heterologous expression.
An expression cassette also can optionally include a transcriptional and/or translational termination region (i.e., termination region) that is functional in the selected host cell. A variety of transcriptional terminators are available for use in expression cassettes and are responsible for the termination of transcription beyond the heterologous nucleotide sequence of interest and correct mRNA polyadenylation. The termination region may be native to the transcriptional initiation region, may be native to the operably linked nucleotide sequence of interest, may be native to the host cell, or may be from another source (i.e., foreign or heterologous to the promoter, to the nucleotide sequence of interest, to the host, or any combination thereof).
An expression cassette of the invention also can include a nucleotide sequence for a selectable marker, which can be used to select a transformed host cell. As used herein, “selectable marker” means a nucleotide sequence that when expressed imparts a distinct phenotype to the host cell expressing the marker and thus allows such transformed cells to be distinguished from those that do not have the marker. Such a nucleotide sequence may encode either a selectable or screenable marker, depending on whether the marker confers a trait that can be selected for by chemical means, such as by using a selective agent (e.g., an antibiotic and the like), or on whether the marker is simply a trait that one can identify through observation or testing, such as by screening (e.g., fluorescence). Of course, many examples of suitable selectable markers are known in the art and can be used in the expression cassettes described herein.
In addition to expression cassettes, the nucleic acid molecules and nucleotide sequences described herein can be used in connection with vectors. The term “vector” refers to a composition for transferring, delivering or introducing a nucleic acid (or nucleic acids) into a cell. A vector comprises a nucleic acid molecule comprising the nucleotide sequence(s) to be transferred, delivered or introduced. Vectors for use in transformation of host organisms are well known in the art. Non-limiting examples of general classes of vectors include but are not limited to a viral vector, a plasmid vector, a phage vector, a phagemid vector, a cosmid vector, a fosmid vector, a bacteriophage, an artificial chromosome, or an Agrobacterium binary vector in double or single stranded linear or circular form which may or may not be self transmissible or mobilizable. A vector as defined herein can transform prokaryotic or eukaryotic host either by integration into the cellular genome or exist extrachromosomally (e.g. autonomous replicating plasmid with an origin of replication). Additionally included are shuttle vectors by which is meant a DNA vehicle capable, naturally or by design, of replication in two different host organisms, which may be selected from actinomycetes and related species, bacteria and eukaryotic (e.g. higher plant, mammalian, yeast or fungal cells). In some representative embodiments, the nucleic acid in the vector is under the control of, and operably linked to, an appropriate promoter or other regulatory elements for transcription in a host cell. The vector may be a bi-functional expression vector which functions in multiple hosts. In the case of genomic DNA, this may contain its own promoter or other regulatory elements and in the case of cDNA this may be under the control of an appropriate promoter or other regulatory elements for expression in the host cell. Accordingly, the nucleic acid molecules of this invention and/or expression cassettes can be comprised in vectors as described herein and as known in the art.
As used herein, “contact”, contacting”, “contacted,” and grammatical variations thereof, refers to placing the components of a desired reaction together under conditions suitable for carrying out the desired reaction (e.g., transcriptional control, genome editing, nicking, cleavage, and/or amplifying nucleic acids).
“Introducing,” “introduce,” “introduced” (and grammatical variations thereof) in the context of a polynucleotide of interest means presenting the nucleotide sequence of interest to the host organism or cell of said organism (e.g., host cell) in such a manner that the nucleotide sequence gains access to the interior of a cell. Where more than one nucleotide sequence is to be introduced these nucleotide sequences can be assembled as part of a single polynucleotide or nucleic acid construct, or as separate polynucleotide or nucleic acid constructs, and can be located on the same or different expression constructs or transformation vectors. Accordingly, these polynucleotides can be introduced into a host cell in a single transformation event, in separate transformation events, or, for example, they can be incorporated into an organism by conventional breeding protocols.
The term “transformation” as used herein refers to the introduction of a heterologous nucleic acid into a cell. Transformation of a cell may be stable or transient. Thus, in some embodiments, a host cell or host organism is stably transformed with a nucleic acid molecule of the invention. In other embodiments, a host cell or host organism is transiently transformed with a recombinant nucleic acid molecule of the invention.
“Transient transformation” in the context of a polynucleotide means that a polynucleotide is introduced into the cell and does not integrate into the genome of the cell.
By “stably introducing” or “stably introduced” in the context of a polynucleotide introduced into a cell is intended that the introduced polynucleotide is stably incorporated into the genome of the cell, and thus the cell is stably transformed with the polynucleotide.
“Stable transformation” or “stably transformed” as used herein means that a nucleic acid molecule is introduced into a cell and integrates into the genome of the cell. As such, the integrated nucleic acid molecule is capable of being inherited by the progeny thereof, more particularly, by the progeny of multiple successive generations. “Genome” as used herein also includes the nuclear and the plastid genome, and therefore includes integration of the nucleic acid into, for example, the chloroplast or mitochondrial genome. Stable transformation as used herein can also refer to a transgene that is maintained extrachromasomally, for example, as a minichromosome or a plasmid.
Transient transformation may be detected by, for example, an enzyme-linked immunosorbent assay (ELISA) or Western blot, which can detect the presence of a peptide or polypeptide encoded by one or more transgene introduced into an organism. Stable transformation of a cell can be detected by, for example, a Southern blot hybridization assay of genomic DNA of the cell with nucleic acid sequences which specifically hybridize with a nucleotide sequence of a transgene introduced into an organism (e.g., a plant). Stable transformation of a cell can be detected by, for example, a Northern blot hybridization assay of RNA of the cell with nucleic acid sequences which specifically hybridize with a nucleotide sequence of a transgene introduced into a host organism. Stable transformation of a cell can also be detected by, e.g., a polymerase chain reaction (PCR) or other amplification reactions as are well known in the art, employing specific primer sequences that hybridize with target sequence(s) of a transgene, resulting in amplification of the transgene sequence, which can be detected according to standard methods Transformation can also be detected by direct sequencing and/or hybridization protocols well known in the art.
Accordingly, in some embodiments, the nucleotide sequences, constructs, expression cassettes can be expressed transiently and/or they can be stably incorporated into the genome of the host organism.
A recombinant nucleic acid molecule/polynucleotide of the invention can be introduced into a cell by any method known to those of skill in the art. In some embodiments of the invention, transformation of a cell comprises nuclear transformation. In other embodiments, transformation of a cell comprises plastid transformation (e.g., chloroplast transformation). In still further embodiments, the recombinant nucleic acid molecule/polynucleotide of the invention can be introduced into a cell via conventional breeding techniques.
Procedures for transforming both eukaryotic and prokaryotic organisms are well known and routine in the art and are described throughout the literature (See, for example, Jiang et al. 2013. Nat. Biotechnol. 31:233-239; Ran et al. Nature Protocols 8:2281-2308 (2013))
A nucleotide sequence therefore can be introduced into a host organism or its cell in any number of ways that are well known in the art. The methods of the invention do not depend on a particular method for introducing one or more nucleotide sequences into the organism, only that they gain access to the interior of at least one cell of the organism. Where more than one nucleotide sequence is to be introduced, they can be assembled as part of a single nucleic acid construct, or as separate nucleic acid constructs, and can be located on the same or different nucleic acid constructs. Accordingly, the nucleotide sequences can be introduced into the cell of interest in a single transformation event, or in separate transformation events, or, alternatively, where relevant, a nucleotide sequence can be incorporated into a plant, for example, as part of a breeding protocol.
The present invention is directed to the use of CRISPR-Cas systems for site-specific cleavage or nicking of a target DNA, transcriptional control of a target DNA, DNA editing, cleaving a double stranded polynucleotide, for detection and typing of bacteria, and for introducing immunity to invasive foreign DNA (e.g., bacteriophage, plasmid, and the like) into bacteria.
In one aspect of the invention a protein-RNA complex is provided, comprising, consisting essentially of, or consisting of the following components: (a) a Cas9 polypeptide comprising, consisting essentially of, or consisting of an amino acid sequence having at least about 80% (e.g., 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, and/or 100%) identity to an amino acid sequence of any of SEQ ID NOs:194-293 and/or a functional fragment thereof; (b) a Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) RNA (crRNA) comprising a 3′ region and a 5′ region, wherein the 3′ region comprises at least about 10 consecutive nucleotides (e.g., about 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or more consecutive nucleotides) of a Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) repeat comprising a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:1-98, and/or a functional fragment thereof, and the 5′ region comprises at least about 10 consecutive nucleotides (e.g., about 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or more consecutive nucleotides) of a spacer sequence located upstream of the repeat; and (c) a tracrRNA comprising a 5′ and 3′ region wherein at least a portion of the 5′ region of the tracrRNA is complementary to the 3′ region (CRISPR repeat) of the crRNA.
In a further aspect, the present invention provides a chimeric RNA construct comprising, consisting essentially of, or consisting of (a) a crRNA comprising a 3′ region and a 5′ region, wherein the 3′ region comprises at least about 10 consecutive nucleotides (e.g., about 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or more consecutive nucleotides) of a CRISPR repeat comprising a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:1-98, and/or a functional fragment thereof, and the 5′ region comprises at least about 10 consecutive nucleotides (e.g., about 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or more consecutive nucleotides) of a spacer sequence located immediately upstream of the repeat, and (b) a tracrRNA comprising a 5′ and 3′ region, wherein at least a portion of the 5′ region of the tracrRNA is complementary to the 3′ region (repeat) of the crRNA and the 3′ region of said tracrRNA forms secondary structures (e.g., hairpin structures).
In some embodiments, the 5′ region of the tracrRNA of the protein-RNA complex and/or the chimeric RNA can comprise, consist essentially of, or consist of at least about 20 nucleotides (e.g., 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36 or more consecutive nucleotides) complementary to the at least 20 consecutive nucleotides of the 3′ region of the crRNA. In some embodiments, the tracrRNA of the protein-RNA complex and/or the chimeric RNA comprises a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:99-193, and/or a functional fragment thereof.
As is well known in the art, Cas9 polypeptides are multifunctional proteins that bind DNA (e.g., target DNA), RNA (guide RNA) and specific nucleotide sequences called protospacer adjacent motifs (PAM), in addition to comprising nuclease/nickase activity (RuH and NHN motifs) that allows them to cut each strand of a double stranded nucleic acid. In some embodiments of the invention, a CRISPR Cas9 polypeptide can be a Cas9 polypeptide from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. As noted above, Cas9 polypeptides can recognize and bind to the PAM sequences that are located on the target DNA. Cas9 polypeptides exhibit specificity for the particular PAM sequence that they recognize and bind to. For example,
In representative embodiments, a Cas9 polypeptide can be encoded by a nucleotide sequence of any of SEQ ID NOs:294-388, and/or a functional fragment thereof, or a polypeptide comprising the amino acid sequence of SEQ ID NOs:194-293, and/or a functional fragment thereof, or encoded by a nucleotide sequence encoding a polypeptide comprising the amino acid sequence of SEQ ID NOs:194-293, and/or a functional fragment thereof. In some embodiments, a Cas9 polypeptide can comprise a HNH and/or a RuvC motif comprising HNH and/or RuvC nickase activities, respectively. In other embodiments, a Cas9 polypeptide can be a deactivated (e.g., mutated, dCAs9) Cas9 polypeptide, wherein the deactivated Cas9 does not comprise HNH and/or RuvC nickase activities. The HNH and RuvC motifs have been characterized in S. thermophilus (see, e.g., Sapranauskas et al. Nucleic Acids Res. 39:9275-9282 (2011)) and one of skill would be able to identify and mutate these motifs in Cas9 polypeptides from other organisms. Notably, a Cas9 polypeptide in which the HNH motif and/or RuvC motif is/are specifically mutated so that the nickase activity is reduced, deactivated, and/or absent, can retain one or more of the other known Cas9 functions including DNA, RNA and PAM recognition and binding activities and thus remain functional with regard to these activities, while non-functional with regard to one or both nickase activities.
The structure of Cas9 polypeptides is described in the art and understood to comprise a nuclease lobe (NUC) and a recognition lobe (REC), with the NUC lobe interacting with the PAM and target DNA, while the REC lobe interacts with and binds to the sgRNA (crRNA-tracrRNA) (see, Barrangou, R. Science 344:707-708 (2104), generally and figure presented therein. It is between the groove located between the two lobes that the sgRNA-target DNA heteroduplex is formed. Id. Further, as noted above, the HNH and RuvC motifs of a Cas9 polypeptide have been characterized (Sapranauskas et al. Nucleic Acids Res. 39:9275-9282 (2011)). Additional details regarding the structure of Cas9 polypeptides and their interaction with tracrRNA and crRNA (sgRNAs) can be found in Nishimasu et al. (Cell 156(5):935-949 (2014)). Here, they provide the crystal structure of Cas9 in complex with guide RNA and target RNA as well as schematics of the sgRNA:target DNA complex and the structure of the Cas9 polypeptide. Thus, the structure of the Cas9 polypeptide is well characterized with the various functions of the protein associated with defined structures within the polypeptide.
Accordingly, a further embodiment of the invention provides a functional fragment of a Cas9 polypeptide comprising one or more of the functions of the functions of a Cas9 polypeptide including but not limited to HNH activity, RuvC activity, DNA recognition and/or binding, RNA recognition and/or binding, and/or PAM recognition and/or binding.
Accordingly, in further embodiments, the CRISPR Cas9 polypeptide can be a functional fragment of a CRISPR Cas9 polypeptide. Accordingly, in some embodiments, a functional fragment of a CRISPR Cas9 polypeptide can be a functional fragment of a Cas9 polypeptide from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. In other embodiments, a functional fragment of a CRISPR Cas9 polypeptide can be a functional fragment from an amino acid sequence of any of SEQ ID NOs:194-293. In some embodiments, the functional fragment of a Cas9 polypeptide can comprise HNH and/or RuvC nickase activities, respectively. In other embodiments, the functional fragment of a Cas9 polypeptide can be deactivated (mutated) in that it does not comprise HNH and/or RuvC nickase activity. Notably, a Cas9 functional fragment comprising a mutation in either or both the HNH motif and RuvC motif so that one or both nickase activities are reduced, deactivated, and/or absent, can retain their DNA, RNA and/or PAM recognition and binding activities, as described above, and therefore, such Cas9 fragments remain functional fragments with regard to at least one of these recognition and binding activities.
In some embodiments, a crRNA of this invention, comprising a 3′ region and a 5′ region, can further comprise a CRISPR repeat located upstream of the spacer sequence, wherein the CRISPR repeat comprises, consists essentially, or consists of at least about 10 consecutive nucleotides of CRISPR repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. (e.g., SEQ ID NOs:1-98, or a functional fragment thereof). Therefore, in representative embodiments, a crRNA can comprise, consist essentially of, or consist of (from 5′ to 3′) a spacer sequence—a CRISPR repeat, or a CRISPR repeat—a spacer sequence—a CRISPR repeat. As used herein, a “functional fragment” of a crRNA means a portion of said crRNA which binds to the corresponding tracrRNA and/or a portion of which is recognized and bound to a corresponding Cas9 polypeptide.
A “spacer sequence” as used herein means a sequence that is upstream (5′) of a repeat in a crRNA. Alternatively, when the crRNA comprises two repeats (i.e., a first and a second repeat) the spacer sequence is located between the two repeats (i.e., the spacer sequence is located 3′ of the first repeat and 5′ of the second repeat). Generally, the spacer sequence comprises a polynucleotide sequence that is complementary to a target DNA and/or an invasive foreign (e.g., heterologous) DNA (e.g., a nucleotide sequence from a bacteriophage, plasmid or chromosome that is foreign to, for example, a bacterium or an archaeon). The spacer sequence can be at least 70% complementary (e.g., 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100% homologous) to the target or invasive foreign DNA. In representative embodiments, the spacer sequence is 100% complementary to the target or invasive foreign DNA. In other embodiments, the complementarity of the 3′ region of the spacer sequence to the target or invasive foreign DNA is 100% but is less than 100% in the 5′ region of the spacer. Thus, for example, the first 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, and the like, nucleotides in the 3′ region of a 20 nucleotide spacer sequence (seed sequence) can be 100% complementary the target or invasive foreign DNA, while the remaining nucleotides in the 5′ region of the spacer sequence are at least about 70% complementary to the target or invasive foreign DNA. In representative embodiments, the first 12 nucleotides of the spacer sequence can be 100% complementary to the target or invasive foreign DNA, while the remaining nucleotides in the 5′ region of the spacer sequence be at least about 70% complementary to the target or invasive foreign DNA.
In some embodiments, a repeat for use with this invention can comprise, consist essentially of, or consist of a repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. In some embodiments, a repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. comprises, consists essentially of, or consists of a nucleotide sequence of any of SEQ ID NOs:1-98, or a functional fragment thereof.
The 5′ region of the tracrRNA is described herein as complementary to the 3′ region (repeat) of the crRNA. In some embodiments, “complementary” means having at least about 70% or more (e.g., about 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%) homology to the 3′ repeat of the crRNA. Thus, for example, the 5′ region of a tracrRNA that is complementary to a 20 nucleotide sequence of a crRNA can have complementarity to about 14 out of 20 consecutive nucleotides of the crRNA repeat. In representative embodiments, the 5′ region of a tracrRNA that is complementary to a 20 nucleotide sequence of a crRNA can have complementarity to at least 7 consecutive nucleotides (e.g., 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 nucleotides) of the crRNA repeat. In some embodiments, a tracrRNA can comprise, consist essentially of, or consist of a nucleotide sequence of any of SEQ ID NOs:99-193, or a functional fragment thereof. Thus, in some embodiments, a tracrRNA useful with this invention can comprise, consist essentially of, or consist of a “functional” fragment of a nucleotide sequence of any of SEQ ID NOs:99-193, wherein said functional fragment retains the function of at least one of the motifs of a tracrRNA as described herein (e.g., a nexus motif, a hairpin motif, a lower stem motif, an upper stem motif, and/or a bulge motif; see, e.g.,
The present invention further provides expression cassettes and/or vectors comprising or encoding the nucleotide sequences of this invention.
The present invention additionally provides a cell comprising nucleotide sequences, protein-RNA complexes, and/or the chimeric RNAs of this invention. A cell can be from any organism useful with this invention including, but not limited to, a plant cell, bacteria cell, fungal cell, mammalian cell, insect cell, or archaeon cell. In some embodiments, the cell can be, for example, from Homo sapiens, Drosophila melanogaster, Mus musculus, Rattus norvegicus, Caenorhabditis elegans, Saccharomyces cerevisiae, Zea mays, or Arabidopsis thaliana, and the like.
In a further embodiment of the invention, a method for site specific cleavage of a target DNA is provided, comprising contacting a protein-RNA complex of this invention with the target DNA, thereby producing a site specific cleavage of the target DNA in the region defined by the complementary binding of the spacer sequence of the crRNA to the target nucleic acid. In another embodiment of the invention, a method for site specific cleavage of a target DNA is provided, comprising contacting a chimeric RNA of this invention, or an expression cassette or vector comprising or encoding a chimeric RNA of this invention with the target DNA in the presence of a Cas9 polypeptide, thereby producing a site specific cleavage of the target nucleic acid in a region defined by complementary binding of the spacer sequence of the crRNA to the target DNA. (See, e.g.,
In some embodiments, a method of transcriptional control of a target DNA is provided, the method comprising: contacting a protein-RNA complex of this invention with the target DNA, wherein the Cas9 polypeptide of the complex is deactivated and the complex binds to the target DNA, thereby controlling the transcription of the target DNA. In other embodiments, a method of transcriptional control of a target DNA is provided, the method comprising: contacting a chimeric RNA of this invention, or an expression cassette or vector comprising or encoding a chimeric RNA of this invention with the target DNA in the presence of an deactivated Cas9 polypeptide, wherein the chimeric RNA binds to the target DNA, thereby controlling the transcription of the target DNA. (See,
“Transcriptional control” as used herein means modulating expression of a target DNA (i.e., activation (increasing) and/or repression (decreasing) expression of the target DNA) (see, e.g.,
In other embodiments, the invention provides a method of editing a target DNA, comprising: contacting the target DNA with a protein-RNA complex of this invention, wherein the complex binds to the target DNA, thereby editing the target DNA. In still other embodiments, the invention provides a method of editing DNA of a target DNA, comprising: contacting the target DNA with a chimeric RNA of this invention, or an expression cassette or vector comprising or encoding a chimeric RNA of this invention in the presence of a Cas9 polypeptide, wherein the chimeric RNA binds to the target DNA, thereby editing the target DNA. (See,
In some embodiments, contacting a target DNA with a protein-RNA complex comprises contacting the target DNA with a protein-RNA complex encoded or comprised in an expression cassette or vector. Accordingly, in some embodiments, an expression cassette and/or vector can be constructed to express a Cas9 polypeptide and produce a tracrRNA-crRNA (sgRNA). In other embodiments, a Cas9 polypeptide can be provided in combination with an expression cassette or vector comprising or encoding a sgRNA. In further embodiments, no expression cassette or vector is utilized, instead a protein-RNA complex itself can be contacted with the target DNA.
Additional embodiments of the invention provide a method for cleaving a double stranded polynucleotide, comprising contacting a protein-RNA complex, wherein the polynucleotide comprises, consists essentially of, or consists of (a) a protospacer sequence that is least about 80% (e.g., about 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%) complementary to the spacer sequence in the crRNA in the complex, and (b) a protospacer adjacent motif (PAM) comprising, consisting essentially of, or consisting of a nucleotide sequence of 5′-NGG-3′, 5′-NGAAA-3′, 5′-NNG-3′, 5′-NGA-3′, 5′-NTAA-3′, 5′-NTG-3′, 5′-NNC-3′, 5′-NNAAC-3′, 5′-AGA-3′, 5′-NNNANNA-3′, 5′-NNANAA-3′, 5′-NNAAAA-3′, and/or 5′-AAAA-3′ downstream from the protospacer sequence, thereby cleaving the polynucleotide in the region defined by complementary binding of the spacer sequence of the crRNA of the protein-RNA complex to the polynucleotide. In some embodiments, the polypeptide of the complex cleaves both strands of the ds polynucleotide at a cleavage site located 0 to 3 nucleotides upstream of the PAM sequence to create blunt ends (i.e., cleaves 3nt upstream of the 3′ edge of the spacer sequence, which is 0 to 3 nucleotides away from the PAM sequence).
The present invention further provides a method for site specific cleavage of a target DNA, comprising contacting the target DNA with a CRISPR RNA (crRNA), said crRNA comprising a 5′ region and a 3′ region, and a trans-encoded CRISPR RNA (tracrRNA) comprising a 5′ region and a 3′ region in the presence of a Cas9 polypeptide, wherein (a) the crRNA comprises, consists essentially of, or consists of at its 3′ region a repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., (e.g., SEQ ID NOs:1-98, or a functional fragment thereof) and at its 5′ region a spacer sequence from the target DNA, (b) the tracrRNA comprises, consists essentially of, or consists of a sequence at its 5′ region that is complementary to the repeat of the crRNA, and (c) the spacer sequence hybridizes with a portion of the target DNA that is complementary to the spacer sequence and adjacent to a protospacer adjacent motif (PAM) comprising, consisting essentially of, or consisting of the nucleotide sequence of any one of the nucleotide sequences of 5′-NGG-3′, 5′-NGAAA-3′, 5′-NNG-3′, 5′-NGA-3′, 5′-NTAA-3′, 5′-NTG-3′, 5′-NNC-3′, 5′-NNAAC-3′, 5′-AGA-3′, 5′-NNNANNA-3′, 5′-NNANAA-3′, 5′-NNAAAA-3′, and/or 5′-AAAA-3′, thereby resulting in a site specific cleavage of the target DNA in the region defined by the complementary binding of the spacer sequence of the crRNA to the target DNA. In some embodiments, the 3′ region of the crRNA comprises, consists essentially of, or consists of at least about 10 consecutive nucleotides of the repeat and the 5′ region of the crRNA comprises, consists essentially of, or consists of at least about 10 consecutive nucleotides of the spacer sequence. In further embodiments, the crRNA can comprise, consist essentially of, or consist of a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:1-98, and/or a functional fragment thereof, and/or the the tracrRNA can comprise, consist essentially of, or consist of a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:99-193, and/or a functional fragment thereof.
A Cas9 polypeptide or nuclease useful with this invention can be any Cas9 polypeptide from, for example, Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. In some embodiments, a Cas9 polypeptide can comprise, consist essentially of, or consist of an amino acid sequence having at least about 80% (e.g., 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%) identity to a polypeptide comprising the amino acid sequence of SEQ ID NOs:194-293, and/or a functional fragment thereof. Depending on the method for which it is being used, a Cas9 polypeptide can comprise the activity of an NHN and/or a RuvC nickase. In other embodiments, the Cas9 polypeptide is deactivated and therefore does not comprise HNH nickase activity. In some embodiments, the Cas9 polypeptide is deactivated and therefore does not comprise RuvC nickase activity. In still other embodiments, the Cas9 polypeptide is deactivated and therefore does not comprise RuvC nickase activity or HNH nickase activity. As described herein, Cas9 polypeptides are multifunctional proteins. Therefore, a Cas9 polypeptide that is deactivated with regard to either or both of the above described nickase activities, can still retain the polypeptide's other functions including DNA, RNA and PAM recognition and binding activity.
In other aspects of the invention, a method for site-specific nicking of a (+) strand of a double stranded target DNA is provided, the method comprising contacting a protein-RNA complex with a double stranded target DNA, wherein the complex comprises, consists essentially of, or consists of (a) a crRNA comprising, consisting essentially of, or consisting of a 3′ region and a 5′ region, wherein the 3′ region comprises, consists essentially of, or consists of at least about 10 consecutive nucleotides of a CRISPR repeat from a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., and the 5′ region comprises, consists essentially of, or consists of at least about 10 consecutive nucleotides of a spacer sequence located upstream of the repeat, (b) a tracrRNA comprising a 5′ and 3′ region wherein at least a portion of the 5′ region of the tracrRNA is complementary to the 3′ region (repeat) of the crRNA, and (c) a polypeptide comprising, consisting essentially of, or consisting of any of the amino acid sequences of SEQ ID NOs:194-293, and/or a functional fragment thereof, comprising a point mutation in the RuvC active site motif; and the target DNA comprises, consists essentially of, or consists of a protospacer sequence that is at least about 80% (e.g., 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, or 100%) complementary to the spacer sequence in the crRNA and a protospacer adjacent motif (PAM) sequence of any one of the nucleotide sequences of 5′-NGG-3′, 5′-NGAAA-3′, 5′-NNG-3′, 5′-NGA-3′, 5′-NTAA-3′, 5′-NTG-3′, 5′-NNC-3′, 5′-NNAAC-3′, 5′-AGA-3′, 5′-NNNANNA-3′, 5′-NNANAA-3′, 5′-NNAAAA-3′, and/or 5′-AAAA-3′ downstream from the proto-spacer sequence, wherein the polypeptide cleaves the (+) strand of the double stranded DNA at a cleavage site located 5 nucleotides upstream of the PAM sequence, thereby producing a site-specific nick in said double stranded target DNA. Thus, by mutating the RuvC active site, the Cas9 polypeptide can no longer cut the (−) strand of the target DNA (the RuvC motif cuts the (−) strand 5 nucleotides upstream of the PAM), thereby resulting only in a cut in the (+) strand of the target DNA.
In a further aspect of the invention, a method for site-specific nicking of the (−) strand of a double stranded target DNA is provided, the method comprising contacting a protein-RNA complex with a double stranded target DNA, wherein the complex comprises, consists essentially of, or consists of (a) a crRNA comprising, consisting essentially of, or consisting of a 3′ region and a 5′ region, wherein the 3′ region comprises, consists essentially of, or consists of at least about 10 consecutive nucleotides of a CRISPR repeat from a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. and the 5′ region comprises, consists essentially of, or consists of at least about 10 consecutive nucleotides of a spacer sequence located a upstream of the repeat, and (b) a tracrRNA comprising, consisting essentially of, or consisting of a 5′ and 3′ region wherein at least a portion of the 5′ region of the tracrRNA is complementary to the 3′ region (repeat) of the crRNA, (c) a polypeptide comprising, consisting essentially of, or consisting of any of the amino acid sequences of SEQ ID NOs:194-293, and/or a functional fragment thereof, comprising a point mutation in an HNH active site motif; and the target DNA comprises, consists essentially of, or consists of a protospacer sequence that is at least about 80% complementary to the spacer sequence in the crRNA and a protospacer adjacent motif (PAM) sequence comprising a nucleotide sequence of any one of the nucleotide sequences of 5′-NGG-3′, 5′-NGAAA-3′, 5′-NNG-3′, 5′-NGA-3′, 5′-NTAA-3′, 5′-NTG-3′, 5′-NNC-3′, 5′-NNAAC-3′, 5′-AGA-3′, 5′-NNNANNA-3′, 5′-NNANAA-3′, 5′-NNAAAA-3′, and/or 5′-AAAA-3′ downstream from the proto-spacer sequence, wherein the polypeptide cleaves the (−) strand of the double stranded DNA at a cleavage site located 5 nucleotides upstream of the PAM sequence resulting in site-specific nicking of the target DNA. By providing a Cas9 comprising a mutation in an HNH active site, the Cas9 polypeptide can no longer cut the (+) strand of the target DNA (the HNH motif cuts the (+) strand 5nt upstream of the PAM), thereby resulting only in a cut in the (+) strand of the target DNA.
A CRISPR repeat from a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. useful for site specific nicking can include any one of the nucleotide sequences of SEQ ID NOs:1-98 or a functional fragment thereof. A tracrRNA useful for site specific nicking can include any one of the nucleotide sequences of SEQ ID NOs:99-193, or a functional fragment thereof. Thus, for example, in some embodiments, a tracrRNA can comprise, consist essentially of, or consist of a fragment of a nucleotide sequence of any of SEQ ID NOs:99-193, wherein said fragment comprises, consists essentially of, consists of a nexus motif, a hairpin motif, a lower stem motif, an upper stem motif, a bulge motif and/or a combination thereof (see e.g.,
A further embodiment of the invention provides a method for site-specific cleavage of a target DNA in vivo, the method comprising: introducing a protein-RNA complex into at least one cell, wherein the protein-RNA complex comprises, consists essentially of, or consists of a crRNA comprising in its 3′ region a repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., and in its 5′ region a spacer sequence having complementarity to a site in the target DNA in which a modification is desired; and a polypeptide having at least about 80% identity with a Cas9 polypeptide of Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., and a tracrRNA comprising, consisting essentially of, or consisting of a sequence at its 5′ region that is complementary to the repeat of the crRNA, thereby producing a site-specific cleavage of the target DNA molecule in a region that is determined by the complementary spacer sequence of the crRNA to the target DNA molecule. In some embodiments, the target DNA contains a protospacer sequence that is least 80% complementary to the spacer sequence in the crRNA of the protein-RNA complex, and a protospacer adjacent motif (PAM) sequence comprising, consisting essentially of, or consisting of a nucleotide sequence of any of the nucleotide sequences of 5′-NGG-3′, 5′-NGAAA-3′, 5′-NNG-3′, 5′-NGA-3′, 5′-NTAA-3′, 5′-NTG-3′, 5′-NNC-3′, 5′-NNAAC-3′, 5′-AGA-3′, 5′-NNNANNA-3′, 5′-NNANAA-3′, 5′-NNAAAA-3′, and/or 5′-AAAA-3′ downstream from the proto-spacer sequence, wherein the polypeptide cleaves both target DNA strands at the cleavage site located 5 nucleotides upstream of the PAM sequence to create blunt ends.
Once the DNA is cleaved, it can then be modified by repair mechanisms as known in the art, notably non-homologous end-joining (NHEJ) and homology-directed repair (HDR). Thus, in some embodiments, a donor DNA can be provided for assisting in repair, such as a dsDNA template for homologous recombination in HDR-mediated repair. See, e.g.,
In representative embodiments, the polypeptide having at least about 80% identity with a Cas9 polypeptide can comprise, consist essentially of, or consist of an amino acid sequence of any of the amino acid sequences of SEQ ID NOs:194-293, and/or a functional fragment thereof, or a functional fragment thereof, the crRNA can comprise, consist essentially of, or consist of a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:1-98, and/or a functional fragment thereof, and/or the tracrRNA can comprise, consist essentially of, or consist of a nucleotide sequence of any one of the nucleotide sequences of SEQ ID NOs:99-193, and/or a functional fragment thereof.
In some embodiments, the polypeptide having at least about 80% identity with a Cas9 polypeptide can be codon optimized for the organism comprising the target DNA as described herein and as known in the art. Non-limiting examples of the types of organisms useful with this invention include plants, bacteria, fungi, mammals, insects, or archaea. Accordingly, in some embodiments, the polypeptide, and/or a functional fragment thereof, having at least about 80% identity with a Cas9 polypeptide (e.g., SEQ ID NOs:194-293, and/or a functional fragment thereof) can be codon optimized to be expressed in the organism comprising the target DNA.
In some embodiments, a repeat, a tracrRNA sequence, a Cas9 polypeptide or and/or a Cas9 nucleotide sequence can be from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. In representative embodiments, a repeat, a tracrRNA sequence, a Cas9 polypeptide or and/or a Cas9 nucleotide sequence can be from Bifidobacterium bombi, Bifidobacterium dentium LMG 11045, Bifidobacterium merycicum LMG 11341, Kandleria vitulina DSM 20405, Lactobacillus agilis DSM 20509, Lactobacillus animalis DSM 20602, Lactobacillus apodemi DSM 16634, Lactobacillus brevis subsp gravensis ATCC 27305, Lactobacillus buchneri CD034, Lactobacillus buchneri DSM 20057, Lactobacillus cacaonum DSM 21116, Lactobacillus casei str Zhang, Lactobacillus ceti DSM 22408, Lactobacillus coryniformis subsp coryniformis KCTC 3167, Lactobacillus coryniformis torquens, Lactobacillus crispatus FB049-03, Lactobacillus curvatus CRL 705, Lactobacillus delbrueckii subsp lactis CRL 581, Lactobacillus delbrueckii jakobsenii DSM 26046, Lactobacillus diolivorans DSM 14421, Lactobacillus farciminis DSM 20184, Lactobacillus fermentum DSM 20055, Lactobacillus floricola DSM 23037A, Lactobacillus floricola DSM 23037B, Lactobacillus fuchuensis DSM 14340, Lactobacillus futsaii JCM 17355, Lactobacillus gasseri K7, Lactobacillus graminis DSM 20719, Lactobacillus hammesii DSM 16381, Lactobacillus hominis CRBIP, Lactobacillus hordei DSM 19519A, Lactobacillus hordei DSM 19519B, Lactobacillus jensenii DSM 20557, Lactobacillus johnsonii DPC 6026, Lactobacillus lindneri DSM 20690, Lactobacillus mali ATCC 27304, Lactobacillus mindensis DSM 14500, Lactobacillus mucosae DSM 13345, Lactobacillus namurensis DSM 19117, Lactobacillus nantensis DSM 16982, Lactobacillus nodensis DSM 19682A, Lactobacillus nodensis DSM 19682B, Lactobacillus oligofermentans DSM 15707, Lactobacillus otakiensis DSM 19908, Lactobacillus ozensis DSM 23829, Lactobacillus paracasei subsp paracasei 8700:2, Lactobacillus paracasei subsp tolerans Lpl7, Lactobacillus paracollinoides DSM 15502, Lactobacillus parakfiri DSM 10551, Lactobacillus pentosus KCA1, Lactobacillus pentosus IG1, Lactobacillus plantarum EGD-AQ4, Lactobacillus psittaci DSM 15354, Lactobacillus rennini DSM 20253, Lactobacillus reutei mlc3, Lactobacillus rhamnosus GG, Lactobacillus rossiae DSM 15814, Lactobacillus ruminis ATCC 25644, Lactobacillus sakei carnosus DSM 15831, Lactobacillus salivarius UCC 118, Lactobacillus sanfranciscensis DSM 20451, Lactobacillus saniviri DSM 24301, Lactobacillus senmaizukei DSM 21775, Lactobacillus tucceti DSM 20183, Lactobacillus versmoldensis DSM 14857, Lactobacillus zymae DSM 19395, Leuconostoc gelidum JB7, Leuconostoc pseudomesenteroides 4882, Oenococcus kitaharae DSM 17330, Pediococcus inopinatus DSM 20285, Pediococcus lolii DSM 19927, Pediococcus parvulus DSM 20332A, Pediococcus parvulus DSM 20332B, Pediococcus stilesii DSM 18001, Streptococcus agalactiae GB00300, Streptococcus gallolyticus ATCC BAA-2069, Streptococcus henryi DSM 19005, Streptococcus mutans NLML5, Streptococcus oralis SK304, Streptococcus anginosus 1_2_62CV, Streptococcus anginosus DSM 20563, Streptococcus dysagalactiae subsp equisimilis, Streptococcus equi subsp zooepidemicus, Streptococcus gordonii Challis substr CH1, Streptococcus infantarius subsp infantarius, Streptococcus intermedius B196, Streptococcus lutetiensis 033, Streptococcus mitis SK321, Streptococcus mutans UA 159, Streptococcus orisratti DSM 15617, Streptococcus parasanguinis F0449, Streptococcus salivarius K12, Streptococcus sanguinis SK330, Streptococcus vestibularis ATCC 49124, Lactobacillus composti DSM 18527, Lactobacillus concavus DSM 17758, Lactobacillus secaliphilus DSM 17896, Weissella halotolerans DSM 20190, Weissella kandleri DSM 20593, and/or Olsenella uli or any combination thereof.
In some embodiments, combinations of repeats, tracrRNA sequences, Cas9 polypeptide sequences and Cas9 nucleotide sequences that may be useful with this invention are set forth in Table 1.
The present invention further provides a method of typing a bacterial or archaeon strain in a sample, comprising amplifying in said sample a region of DNA comprising repetitive sequences that are at least about 80% identical to a nucleotide sequence of SEQ ID NOs:1-98, or a functional fragment thereof, to produce amplified DNA; and typing the bacterial strain based on the amplified DNA. In further embodiments, the method further comprises sequencing the amplified DNA to produce sequence information; and typing the bacterial strain based on the sequence information. In additional embodiments, typing a bacterial strain further comprises contacting the amplified DNA with one or more restriction enzymes capable of cutting the DNA at at least one site to produce restriction fragments; determining the number and/or size of the restriction fragments; and typing the bacterial strain based on the number and/or size of the restriction fragments. “Determining the number and/or size of the restriction fragments” as used herein can mean analyzing the restriction fragments using, for example, agarose gel elextrophoresis and the like as is known in the art.
In still other embodiments, the present invention provides a method of detecting the presence of a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. in a sample, comprising amplifying in said sample a region of DNA comprising repetitive sequences that are at least about 80% identical to the repetitive sequence encoded by a nucleotide sequence of any of the nucleotide sequences of SEQ ID NOs:1-98, or a functional fragment thereof, to produce amplified DNA, and detecting the amplified DNA.
In some embodiments, amplifying a region of DNA comprises amplifying at least about 20 to about 300 consecutive nucleotides of a region of DNA comprising repetitive sequences. Thus, in some embodiments, amplifying a region of DNA comprises amplifying at least about 20, 25, 23, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, or more and the like and any range or value therein of consecutive nucleotides of a region of DNA comprising repetitive sequences Any method of amplifying DNA known in the art and later developed can be used with this invention. A nonlimiting example of a method of amplifying includes polymerase chain reaction (PCR) as described herein and as known in the art. In some embodiments of this invention, amplifying a region of DNA comprises amplifying at least a single spacer and two repeat elements on either side of the single spacer in the repeat-spacer region of a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. In some embodiments of this invention, amplifying a region of DNA comprises amplifying at least about 50, at least about 100, at least about 150, at least about 200, at least about 250, at least about 300, at least about 350 consecutive nucleotides in the repeat-spacer region of a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp.
As would be understood by those of skill in the art, when amplifying a portion of a repeat-spacer region of a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., any primer pair designed to comprise conserved sequences flanking the repeat-spacer array could be used.
Further embodiments of the invention provide a method of identifying a strain of Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. having resistance to an invasive foreign DNA, comprising correlating the presence of a CRISPR spacer with resistance to said invasive foreign DNA (e.g., phage DNA, plasmid DNA, chromosomal DNA, transposon DNA) in Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. having a CRISPR system; and detecting said CRISPR spacer in said strain of a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., thereby identifying said strain as comprising said CRISPR spacer and having resistance to said invasive foreign DNA.
As used herein, “correlate,” “correlating” and grammatical variations thereof mean to establish or establishing an association, a relationship, or a close connection between two or more things. Thus, for example, correlating can mean establishing an association of the presence of one or more particular spacers in a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. strain exhibiting resistance to particular invasive foreign DNA. In the context of identifying a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., “correlating” means amplifying spacer sequences in a resistant strain of Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp., sequencing the amplified spacer sequences and identifying the origin of the spacer sequence by aligning the amplified spacer sequence with protospacer sequences from invasive foreign genomes.
In representative embodiments, detecting comprises amplifying the DNA of said strain of Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. using amplification primers for amplifying the CRISPR spacer correlated with resistance, to produce a CRISPR spacer amplicon when said CRISPR spacer is present, thereby detecting the presence or absence of said CRISPR spacer amplicon.
Methods of visualizing or detecting the presence or absence of a CRSIPR spacer amplicon are well-known in the art and include, for example, gel electrophoresis, sequencing, hybridization and the like.
Other embodiments of the invention provide methods for modifying resistance of a bacterium or an archaeon to an invasive foreign DNA that comprises a target DNA, comprising introducing into cells of said bacterium or archaeon a heterologous nucleic acid molecule comprising, consisting essentially of, or consisting of a first and a second CRISPR repeat from Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. and a CRISPR spacer, wherein the spacer is homologous to at least a portion of the invasive foreign DNA and is located 3′ of the first CRISPR repeat and 5′ of the second CRISPR repeat to produce transformed bacterial or archaea cells, and selecting transformed bacterial or archaea cells having modified resistance to said invasive foreign DNA.
As used herein “modifying the resistance” means conferring or increasing resistance in a bacterium or an archaeon to a particular invasive foreign DNA. If the bacterium or archeaon did not have any resistance to the particular invasive foreign DNA prior to the modification, then resistance is conferred upon the bacteria to said invasive foreign DNA by introducing the heterologous nucleic acid molecule of the invention into the cells of said bacterium or archaeaon, thereby providing a level of resistance to said invasive foreign DNA that is greater than that observed to said invasive foreign DNA in a control (e.g., a control bacterium or archaeaon not comprising said heterologous nucleic acid molecule of the invention). However, if the bacterium or archaeon displayed some level of resistance to said invasive foreign DNA prior to the modification, by introducing the heterologous nucleic acid molecule of the invention into the cells of said bacterium or archaeon, the level of resistance to said invasive foreign DNA in said bacterium or archaeon can be increased as compared to the level of resistance to said invasive foreign DNA in a control bacterium or archaeon (e.g., a bacterium or an archaeon not comprising the heterologous nucleic acid molecule of the invention). In representative embodiments, the bacterium to which resistance to a particular invasive foreign DNA can be modified can be Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp.
In some embodiments, the first and second CRISPR repeats of the heterologous nucleic acid molecule comprise, consist essentially of, or consist of at least about 10 consecutive nucleotides of a repeat from a Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. and the CRISPR spacer comprises, consists essentially of, or consists of at least about 10 consecutive nucleotides of the invasive foreign DNA. In some embodiments, the first and second CRISPR repeats comprise, consist essentially of, or consist of a nucleotide sequence of any of the nucleotide sequences of SEQ ID NOs:1-98, a functional fragment thereof, or any combination thereof. In other embodiments, the spacer sequence can be at least about 80% identical to the at least a portion of the invasive foreign DNA. In still other embodiments, at least about 10 consecutive nucleotides at the 3′ end of the CRISPR spacer can be 100% identical to the at least a portion of the invasive foreign DNA.
In some embodiments, bacteria and archaea that can be typed, detected, identified or modified using methods of this invention include, but are not limited to, those from the genera of Lactobacillus spp., Bifidobacterium spp., Kandleria spp., Leuconostoc spp., Oenococcus spp., Pediococcus spp., Streptococcus spp., Weissella spp., and/or Olsenella spp. In other embodiments, the bacteria and/or archaea that can be typed, detected, identified or modified using the methods of this invention, include but are not limited to Bifidobacterium bombi, Bifidobacterium dentium LMG 11045, Bifidobacterium merycicum LMG 11341, Kandleria vitulina DSM 20405, Lactobacillus agilis DSM 20509, Lactobacillus animalis DSM 20602, Lactobacillus apodemi DSM 16634, Lactobacillus brevis subsp gravensis ATCC 27305, Lactobacillus buchneri CD034, Lactobacillus buchneri DSM 20057, Lactobacillus cacaonum DSM 21116, Lactobacillus casei str Zhang, Lactobacillus ceti DSM 22408, Lactobacillus coryniformis subsp coryniformis KCTC 3167, Lactobacillus coryniformis torquens, Lactobacillus crispatus FB049-03, Lactobacillus curvatus CRL 705, Lactobacillus delbrueckii subsp lactis CRL 581, Lactobacillus delbrueckii jakobsenii DSM 26046, Lactobacillus diolivorans DSM 14421, Lactobacillus farciminis DSM 20184, Lactobacillus fermentum DSM 20055, Lactobacillus floricola DSM 23037A, Lactobacillus floricola DSM 23037B, Lactobacillus fuchuensis DSM 14340, Lactobacillus futsaii JCM 17355, Lactobacillus gasseri K7, Lactobacillus graminis DSM 20719, Lactobacillus hammesii DSM 16381, Lactobacillus hominis CRBIP, Lactobacillus hordei DSM 19519A, Lactobacillus hordei DSM 19519B, Lactobacillus jensenii DSM 20557, Lactobacillus johnsonii DPC 6026, Lactobacillus lindneri DSM 20690, Lactobacillus mali ATCC 27304, Lactobacillus mindensis DSM 14500, Lactobacillus mucosae DSM 13345, Lactobacillus namurensis DSM 19117, Lactobacillus nantensis DSM 16982, Lactobacillus nodensis DSM 19682A, Lactobacillus nodensis DSM 19682B, Lactobacillus oligofermentans DSM 15707, Lactobacillus otakiensis DSM 19908, Lactobacillus ozensis DSM 23829, Lactobacillus paracasei subsp paracasei 8700:2, Lactobacillus paracasei subsp tolerans Lpl7, Lactobacillus paracollinoides DSM 15502, Lactobacillus parakfiri DSM 10551, Lactobacillus pentosus KCA1, Lactobacillus pentosus IG1, Lactobacillus plantarum EGD-AQ4, Lactobacillus psittaci DSM 15354, Lactobacillus rennini DSM 20253, Lactobacillus reutei mlc3, Lactobacillus rhamnosus GG, Lactobacillus rossiae DSM 15814, Lactobacillus ruminis ATCC 25644, Lactobacillus sakei carnosus DSM 15831, Lactobacillus salivarius UCC 118, Lactobacillus sanfranciscensis DSM 20451, Lactobacillus saniviri DSM 24301, Lactobacillus senmaizukei DSM 21775, Lactobacillus tucceti DSM 20183, Lactobacillus versmoldensis DSM 14857, Lactobacillus zymae DSM 19395, Leuconostoc gelidum JB7, Leuconostoc pseudomesenteroides 4882, Oenococcus kitaharae DSM 17330, Pediococcus inopinatus DSM 20285, Pediococcus lolii DSM 19927, Pediococcus parvulus DSM 20332A, Pediococcus parvulus DSM 20332B, Pediococcus stilesii DSM 18001, Streptococcus agalactiae GB00300, Streptococcus gallolyticus ATCC BAA-2069, Streptococcus henryi DSM 19005, Streptococcus mutans NLML5, Streptococcus oralis SK304, Streptococcus anginosus 1_2_62CV, Streptococcus anginosus DSM 20563, Streptococcus dysagalactiae subsp equisimilis, Streptococcus equi subsp zooepidemicus, Streptococcus gordonii Challis substr CH1, Streptococcus infantarius subsp infantarius, Streptococcus intermedius B196, Streptococcus lutetiensis 033, Streptococcus mitis SK321, Streptococcus mutans UA 159, Streptococcus orisratti DSM 15617, Streptococcus parasanguinis F0449, Streptococcus salivarius K12, Streptococcus sanguinis SK330, Streptococcus vestibularis ATCC 49124, Lactobacillus composti DSM 18527, Lactobacillus concavus DSM 17758, Lactobacillus secaliphilus DSM 17896, Weissella halotolerans DSM 20190, Weissella kandleri DSM 20593, and/or Olsenella uli
The invention will now be described with reference to the following examples. It should be appreciated that these examples are not intended to limit the scope of the claims to the invention, but are rather intended to be exemplary of certain embodiments. Any variations in the exemplified methods that occur to the skilled artisan are intended to fall within the scope of the invention.
EXAMPLES Example 1 Characterization of CRISPR Repeat, tracrRNA, Cas9 Polypeptide and PAM Sequences from Different Species and Strains of Bacteria and ArchaeaCRISPR repeat, tracrRNA, Cas9 polypeptide and PAM sequences were isolated from different species and strains of bacteria and archae. The list of bacterial/archaea species/strains from which at least a CRISPR repeat (e.g., SEQ ID NOs:1-98), tracrRNA sequence (e.g., SEQ ID NOs:99-193), Cas9 polypeptide sequence (e.g., SEQ ID NOs:194-293), or a PAM sequence (Table 3, below) was isolated is provided in Table 2, below.
The predicted secondary structures of the single guide RNAs (sgRNAs) (crRNA-tracrRNA) from Streptococcus species/strains are provided in
Upon isolation of the various components of the CRISPR-Cas system from each of the above identified bacteria/archaea, a phylogenetic comparison was done and the relatedness is provided in
The congruence between tracrRNA (left), CRISPR repeat (middle) and Cas9 (right) sequence clustering is provided in
Cas9 polypeptides from the various bacteria and archeae species/strains were also grouped according to their corresponding protospacer adjacent motifs (PAM) (left,
Thus, with the knowledge of the specific structures and relatedness of the various nucleotide sequences and polypeptide sequences of the CRISPR-Cas systems as described herein, new and diverse synthetic sgRNAs, chimeric RNAs and protein-RNA complexes can be constructed, which can be used for, for example, specific targeting and cleaving of target DNA, editing of target DNA (e.g., generating altered genotypes), transcriptional control of target genes (repression and activation) and/or DNA labeling. Specifically, chimeric guide RNAs can be constructed from the tracrRNA sequences and crRNA sequences in various combinations, swapping out one or more portions of sequences from one (or more) species with portions of sequences from another species, to produce a multitude of different guides functional with one or more Cas9 polypeptide(s) and PAMs, thereby providing increased flexibility and optimization of sgRNA composition and design for different needs.
Example 2 Predicting Orthogonal GroupsThe groups in Panels A, B, C and D of
Using a plasmid interference assay activity of the Type II CRISPR-Cas system in Lactobacillus gasseri (Lga) was investigated (see,
Using a plasmid interference assay activity of the Type II CRISPR-Cas system in Lactobacillus rhamnosus (Lrh) was also investigated (see,
Using a plasmid interference assay activity of the Type II CRISPR-Cas system in Lactobacillus pentosus (Lpe) (see,
In addition, a plasmid interference assay was used to show the activity of the Type II CRISPR-Cas system in Lactobacillus jensenii (Lje) (see,
The activity of the Type II CRISPR-Cas system in Lactobacillus casei (Lcas) was investigated using a plasmid interference assay (see,
Finally, Neighbor-joining trees from MUSCLE alignments of the Cas1 protein and of Cas9 protein are provided in Panel A and Panel B of
The above examples clearly illustrate the advantages of the invention. Although the present invention has been described with reference to specific details of certain embodiments thereof, it is not intended that such details should be regarded as limitations upon the scope of the invention except as and to the extent that they are included in the accompanying claims.
Claims
1. A protein-chimeric RNA complex comprising:
- (a) a Cas9 polypeptide comprising an amino acid sequence having at least about 80% identity to the amino acid sequence of any of SEQ ID NO:220, and/or a functional fragment thereof; and
- (b) a chimeric RNA comprising: (i) a Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) RNA (crRNA) comprising a 3′ region and a 5′ region, wherein the 3′ region comprises at least about 10 consecutive nucleotides of a CRISPR repeat comprising the nucleotide sequence of SEQ ID NO:27, and the 5′ region comprises at least about 10 consecutive nucleotides of a spacer sequence located upstream of the repeat; and
- (ii) a trans-activating crRNA (tracrRNA) comprising a 5′ and 3′ region wherein at least a portion of the 5′ region of the tracrRNA is complementary to the 3′ region (CRISPR repeat) of the crRNA and the 3′ region of said tracrRNA forms a secondary structure, wherein the tracrRNA comprises nucleotides 46 to 129 of the nucleotide sequence of SEQ ID NO:398.
2. The complex of claim 1, wherein the 5′ region of the tracrRNA comprises at least about 10 nucleotides complementary to the at least 10 consecutive nucleotides of the 3′ region of the crRNA.
3. The complex of claim 1, wherein the polypeptide comprises a HNH motif and a RuvC motif.
4. An expression cassette comprising the nucleotide sequence comprising or encoding the protein-chimeric RNA complex of claim 1.
5. A vector comprising the expression cassette of claim 4.
6. A cell comprising the chimeric protein-RNA complex of claim 1, the expression cassette of claim 4.
7. The cell of claim 6, wherein the cell is a plant cell, bacteria cell, fungal cell, mammalian cell, insect cell, or archaeon cell.
8. A method for site-specific cleavage of a target DNA, comprising:
- contacting the target DNA with the protein-chimeric RNA complex of claim 1, thereby producing a site specific cleavage of the target DNA in a region defined by complementary binding of the spacer sequence of the crRNA of said complex to the target DNA.
9. A method of transcriptional control of a target DNA, comprising:
- contacting the target DNA with the protein-chimeric RNA complex of claim 1, wherein the Cas9 polypeptide of the complex is deactivated and the complex binds to the target DNA, thereby controlling the transcription of the target DNA.
10. A method of editing DNA, comprising:
- contacting the target DNA with the protein-chimeric RNA complex of claim 1, wherein the complex binds to the target DNA, thereby editing the target DNA.
11. A method for cleaving a double stranded (ds) polynucleotide, comprising contacting said ds polynucleotide with the protein-chimeric RNA complex of claim 1, wherein the ds polynucleotide comprises
- (a) a protospacer sequence comprising a sequence that is least 80% complementary to the spacer sequence in the crRNA in said complex, and
- (b) a protospacer adjacent motif (PAM) comprising a nucleotide sequence of any one of the nucleotide sequences (5′ to 3′) of CTAACC; CCAAC; CTAAAC; CTCAC; CTAC; CCTAAC; TTGGCC; or CTAAC downstream from the protospacer sequence, thereby cleaving the polynucleotide in the region defined by complementary binding of the spacer sequence of the crRNA to the polynucleotide.
12. The method of claim 11, wherein the polypeptide of the complex cleaves both strands of the polynucleotide at a cleavage site located 0 to 3 nucleotides upstream of the PAM sequence to create blunt ends.
13. A method for site-specific nicking of a (+) strand of a double stranded target DNA, comprising contacting a protein-chimeric RNA complex with a double stranded target DNA, wherein the protein-chimeric RNA complex comprises
- (a) a crRNA comprising a 3′ region and a 5′ region, wherein the 3′ region comprises at least about 10 consecutive nucleotides of a CRISPR repeat comprising the nucleotide sequence of SEQ ID NO:27, and the 5′ region comprises at least about 10 consecutive nucleotides of a spacer sequence located upstream of the repeat,
- (b) to tracRNA comprising a 5′ and 3′ region wherein at least a portion of the 5′ region of the tracRNA is complementary to the 3′ region (CRISPR repeat) of the crRNA, wherein the tracRNA comprises nucleotides 46 to 129 of the nucleotide sequence of SEQ ID NO:398, and
- (c) a polypeptide comprising an amino acid sequence of any of SEQ ID NO:220, or a functional fragment thereof, comprising a point mutation in an RuvC active site motif; and the target DNA comprises a protospacer sequence that is at least about 80% complementary to the spacer sequence in the crRNA, and a protospacer adjacent motif (PAM) sequence of any one of the nucleotide sequences (5′ to 3′) of CTAACC; CCAAC; CTAAAC; CTCAC; CTAC; CCTAAC; TTGGCC; or CTAAC downstream from the proto-spacer sequence,
- wherein the polypeptide cleaves the (+) strand of the double stranded DNA at a cleavage site located 0 to 3 nucleotides upstream of the PAM sequence, thereby producing a site-specific nick in said double stranded target DNA.
14. A method for site-specific nicking of the (−) strand of a double stranded target DNA, comprising contacting protein-chimeric RNA complex of claim 1 with a double stranded target DNA, wherein the Cas9 polypeptide comprises
- a point mutation in an HNH active site motif; and the target DNA comprises a protospacer sequence that is at least about 80% complementary to the spacer sequence in the crRNA and a protospacer adjacent motif (PAM) sequence comprising a nucleotide sequence of any one of the nucleotide sequences (5′ to 3′) of CTAACC; CCAAC; CTAAAC; CTCAC; CTAC; CCTAAC; TTGGCC; or CTAAC downstream from the proto-spacer sequence,
- wherein the polypeptide cleaves the (−) strand of the double stranded DNA at a cleavage site located 0 to 3 nucleotides upstream of the PAM sequence resulting in site-specific nicking of the target DNA.
15. The method of claim 8, wherein the Cas9 polypeptide is codon optimized for an organism comprising the target DNA.
16. The method of claim 15, wherein the organism is a plant, bacteria, fungus, mammal, insect, or archaeon.
17. The method of claim 16, wherein the organism is Homo sapiens, Drosophila melanogaster, Mus musculus, Rattus norvegicus, Caenorhabditis elegans, or Arabidopsis thaliana.
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Type: Grant
Filed: Aug 27, 2015
Date of Patent: Oct 22, 2019
Patent Publication Number: 20170275648
Assignee: NORTH CAROLINA STATE UNIVERSITY (Raleigh, NC)
Inventors: Rodolphe Barrangou (Raleigh, NC), Alexandra E. Briner (Raleigh, NC)
Primary Examiner: Kevin K Hill
Assistant Examiner: Arthur S Leonard
Application Number: 15/507,176
International Classification: C12N 15/113 (20100101); C12N 15/85 (20060101); C12N 15/00 (20060101); C12N 9/22 (20060101); C12N 9/96 (20060101); C12N 15/10 (20060101); C12N 15/63 (20060101); C12N 15/79 (20060101); C12N 15/82 (20060101); C12N 15/86 (20060101); C12N 15/90 (20060101); C12N 15/11 (20060101);
